INDEX.

alpha-table

[A]

[B]

[C]

[A]
Abacus, logical, [104];
arithmetical, [107];
Panchrestus, [182].
Aberration of light, [561];
systematic, [547].
Abscissio infiniti, [79], [713].
Abstract terms, [27];
number, [159].
Abstraction, [704];
logical, [25];
numerical, [158];
of indifferent circumstances, [97].
Accademia del Cimento, [427], [432], [436], [527].
Accident, logical, [700].
Accidental discovery, [529].
Achromatic lenses, [432].
Actinometer, [337].
Adamantine medium, [605], [751].
Adjectives, [14], [30], [31], [35];
indeterminate, [41].
Adrain, of New Brunswick, [375].
Affirmation, [44].
Agassiz, on genera, [726];
on creation of species, [763].
Agreement, [44].
Airy, Sir George Biddell, on perpetual motion, [223];
new property of sphere, [232];
pendulum experiments, [291], [304], [348], [567];
standard clock, [353];
book on Errors of Observation, [395];
tides, [488];
extra-polation, [495];
Thales’ eclipse, [537];
interference of light, [539];
density of earth, [291].
Alchemists, [505];
how misled, [428].
Algebra, [123], [155], [164];
Diophantine, [631].
Algebraic, equations, [123];
geometry, [633].
Allotropic state, [663], [670].
Alloys, possible number, [191];
properties, [528].
Alphabet, the Logical, [93], [104], [125];
Morse, [193].
Alphabet, permutations of letters of the, [174], [179].
Alphabetic indexes, [714].
Alternative relations, [67];
exclusive and unexclusive, [205].
Ampère, electricity, [547];
classification, [679].
Anagrams, [128].
Analogy, [627];
of logical and numerical terms, [160];
and generalisation, [596];
in mathematical sciences, [631];
in theory of undulations, [635];
in astronomy, [638];
failure of, [641].
Analysis, logical, [122].
Andrews, Prof. Thomas, experiments on gaseous state, [71], [613], [665], [753].
Angström, on spectrum, [424].
Angular magnitude, [305], [306], [326].
Antecedent defined, [225].
Anticipation of Nature, [509].
Anticipations, of Principle of Substitution, [21];
of electric telegraph, [671].
Apparent, equality, [275];
sequence of events, [409].
Approximation, theory of, [456];
to exact laws, [462];
mathematical principles of, [471];
arithmetic of, [481].
Aqueous vapour, [500].
Aquinas, on disjunctive propositions, [69].
Arago, photometer, [288];
rotating disc, [535];
his philosophic character, [592].
Archimedes, De Arenæ Numero, [195];
centre of gravity, [363].
Arcual unit, [306], [330].
Argyll, Duke of, [741].
Aristarchus on sun’s and moon’s distances, [294].
Aristotelian doctrines, [666].
Aristotle, dictum, [21];
singular terms, [39];
overlooked simple identities, [40];
order of premises, [114];
logical error, [117];
definition of time, [307];
on science, [595];
on white swans, [666].
Arithmetic, reasoning in, [167];
of approximate quantities, [481].
Arithmetical triangle, [93], [143], [182], [202], [378], [383];
diagram of, [184];
connection with Logical Alphabet, [189];
in probability, [208].
Asteroids, discovery of, [412], [748].
Astronomy, physical, [459].
Atmospheric tides, [553].
Atomic theory, [662].
Atomic weights, [563].
Atoms, size of, [195];
impossibility of observing, [406].
Augustin on time, [307].
Average, [359], [360];
divergence from, [188];
etymology of, [363].
Axes of crystals, [686].
Axioms of algebra, [164].
[B]
Babbage, Charles, calculating machine, [107], [231], [743];
lighthouse signals, [194];
natural constants, [329];
Mosaic history, [412];
universal and general truths, [646];
change of law, [230];
persistence of effects, [757].
Bacon, Francis Lord, Novum Organum, [107];
on induction, [121];
biliteral cipher, [193];
First Aphorism, [219];
on causes, [221];
Copernican system, [249], [638];
deficient powers of senses, [278];
observation, [402];
Natural History, [403];
use of hypothesis, [506];
his method, [507];
experimentum crucis, [519];
error of his method, [576];
ostensive, clandestine instances, &c., [608], [610];
latens precessus, [619].
Bacon, Roger, on the rainbow, [526], [598].
Baily, Francis, [272];
density of earth, [342], [566];
experiments with torsion balance, [370], [397], [432], [567–8];
motions of stars, [572].
Bain, Alexander, on powers of mind, [4];
Mill’s reform of logic, [227].
Baker’s poem, The Universe, [621].
Balance, use of the chemical, [292], [351], [354], [369];
delicacy of, [304];
vibrations of, [369].
Ballot, Buys, experiment on sound, [541].
Ballot-box, simile of, [150], [251–6], [765].
Barbara, [55], [57], [88], [105], [141].
Baroko, [85].
Barometer, [659];
Gay Lussac’s standard, [346];
variations, [337], [346], [349].
Bartholinus on double refraction, [585].
Base-line, measurement of, [304].
Bauhusius, verses of, [175].
Baxendell, Joseph, [552].
Beneke, on substitution, [21].
Bennet, momentum of light, [435].
Bentham, George, [15];
bifurcate classification, [695];
infima species, [702];
works on classification, [703];
analytical key to flora, [712].
Bentham, Jeremy, on analogy, [629];
bifurcate classification, [703].
Benzenberg’s experiment, [388].
Bernoulli, Daniel, planetary orbits, [250];
resisting media and projectiles, [467];
vibrations, [476].
Bernoulli, James, [154];
numbers of, [124];
Protean verses, [175];
De Arte Conjectandi quoted, [176], [183];
on figurate numbers, [183];
theorem of, [209];
false solution in probability, [213];
solution of inverse problem, [261].
Bessel, F. W., [375];
law of error, [384];
formula for periodic variations, [488];
use of hypothesis, [506];
solar parallax, [560–2];
ellipticity of earth, [565];
pendulum experiments, [604].
Bias, [393], [402].
Biela’s comet, [746].
Bifurcate classification, [694].
Binomial theorem, [190];
discovery of, [231].
Biot, on tension of vapour, [500].
Blind experiments, [433].
Bode’s law, [147], [257], [660].
Boethius, quoted, [33];
on kinds of mean, [360].
Boiling point, [442], [659].
Bonnet’s theory of reproduction, [621].
Boole, George, on sign of equality, [15];
his calculus of logic, [23], [113], [634];
on logical terms, [33];
law of commutativeness, [35];
use of some, [41–2];
disjunctive propositions, [70];
Venn on his method, [90];
Laws of Thought, [155];
statistical conditions, [168];
propositions numerically definite, [172];
on probability, [199];
general method in probabilities, [206];
Laplace’s solution of inverse problem, [256];
law of error, [377].
Borda, his repeating circle, [290].
Boscovich’s hypothesis, [512].
Botany, [666], [678], [681];
modes of classification, [678];
systematic, [722];
nomenclature of, [727].
Bowen, Prof. Francis, on inference, [118];
classification, [674].
Boyle’s, Robert, law of gaseous pressure, [468], [470], [619];
on hypothesis, [510];
barometer, [659].
Bradley, his observations, [384];
accuracy of, [271];
aberration of light, [535].
Bravais, on law of error, [375].
Brewer, W. H., [142].
Brewster, Sir David, iridescent colours, [419];
spectrum, [429];
Newton’s theory of colours, [518];
refractive indices, [10], [527];
optic axes, [446].
British Museum, catalogue of, [717].
Brodie, Sir B. C., on errors of experiment, [388], [464];
ozone, [663].
Brown, Thomas, on cause, [224].
Buckle, Thomas, on constancy of average, [656];
science of history, [760].
Buffon, on probability, [215];
definition of genius, [576].
Bunsen, Robert, spectrum, [244];
photometrical researches, [273], [324], [441];
calorimeter, [343].
Butler, Bishop, on probability, [197].
[C]
Calorescence, [664].
Camestres, [84].
Canton, on compressibility of water, [338].
Carbon, [640], [728];
conductibility of, [442].
Cardan, on inclined plane, [501].
Cards, combinations of, [190].
Carlini, pendulum experiments, [567].
Carnot’s law, [606].
Carpenter, Dr. W. B., [412].
Catalogues, art of making, [714].
Cauchy, undulatory theory, [468].
Cause, [220];
definition of, [224].
Cavendish’s experiment, [272], [566].
Cayley, Professor, [145];
on mathematical tables, [331];
numbers of chemical compounds, [544].
Celarent, [55].
Centre of gravity, [363], [524];
of oscillation, gyration, &c., [364].
Centrobaric bodies, [364].
Certainty, [235], [266].
Cesare, [85].
Chalmers, on collocations, [740].
Chance, [198].
Character, human, [733].
Characteristics, [708].
Chauvenet, Professor W., on treatment of observations, [391].
Chemical affinity, [614];
analysis, [713].
Chladni, [446].
Chloroform, discovery of, [531].
Chronoscope, [616].
Cipher, [32];
Bacon’s, [193].
Circle, circumference of, [389].
Circumstances, indifferent, [419].
Circumstantial evidence, [264].
Clairaut, [650], [651];
on gravity, [463].
Classes, [25];
problem of common part of three, [170].
Classification, [673];
involving induction, [675];
multiplicity of modes, [677];
natural and artificial systems, [679];
in crystallography, [685];
symbolic statement of, [692];
bifurcate, [694];
an inverse and tentative operation, [689];
diagnostic, [710];
by indexes, [714];
of books, [715];
in biological sciences, [718];
genealogical, [719];
by types, [722];
limits of, [730].
Clifford, Professor, on types of compound statements, [143], [529];
first and last catastrophe, [744];
mathematical function, [768].
Clocks, astronomical, [340], [353].
Clouds, [447];
cirrous, [411].
Coincidences, [128];
fortuitous, [261];
measurement by, [292];
method of, [291].
Collective terms, [29], [39].
Collocations of matter, [740].
Colours, iridescent, [419];
natural, [518];
perception of, [437];
of spectrum, [584].
Combinations, [135], [142];
doctrine of, [173];
of letters of alphabet, [174];
calculations of, [180];
higher orders of, [194].
Combinatorial analysis, [176].
Comets, [449];
number of, [408];
hyperbolic, [407];
classification of, [684];
conflict with, [746–7];
Halley’s comet, [537];
Lexell’s comet, [651].
Commutativeness, law of, [35], [72], [177].
Comparative use of instruments, [299].
Compass, variations of, [281].
Complementary statements, [144].
Compossible alternatives, [69].
Compound statements, [144];
events, [204].
Compounds, chemical, [192].
Comte, Auguste, on probability, [200], [214];
on prevision, [536];
his positive philosophy, [752], [760], [768].
Concrete number, [159].
Conditions, of logical symbols, [32];
removal of usual, [426];
interference of unsuspected, [428];
maintenance of similar, [443];
approximation to natural, [465].
Condorcet, [2];
his problem, [253].
Confusion of elements, [237].
Conical refraction, [653].
Conjunction of planets, [293], [657].
Consequent, definition of, [225].
Conservation of energy, [738].
Constant numbers of nature, [328];
mathematical, [330];
physical, [331];
astronomical, [332];
terrestrial, [333];
organic, [333];
social, [334].
Continuity, law of, [615], [729];
sense of, [493];
detection of, [610];
failure of, [619].
Continuous quantity, [274], [485].
Contradiction, law of, [31], [74].
Contrapositive, proposition, [84], [136];
conversion, [83].
Conversion of propositions, [46], [118].
Copernican theory, [522], [625], [638], [647].
Copula, [16].
Cornu, velocity of light, [561].
Corpuscular theory, [520], [538], [667].
Correction, method of, [346].
Correlation, [678], [681].
Cotes, Roger, use of mean, [359];
method of least squares, [377].
Coulomb, [272].
Couple, mechanical, [653].
Creation, problem of, [740].
Crookes’ radiometer, [435].
Cross divisions, [144].
Crystallography, [648], [654], [658], [678], [754];
systems of, [133];
classification in, [685].
Crystals, [602];
Dana’s classification of, [711];
pseudomorphic, [658].
Curves, use of, [392], [491], [496];
of various degrees, [473].
Cuvier, on experiment, [423];
on inferences, [682].
Cyanite, [609].
Cycloid, [633].
Cycloidal pendulum, [461].
Cypher, [124].
[D]
D’Alembert, blunders in probability, [213], [214];
on gravity, [463].
Dalton, laws of, [464], [471];
atomic theory, [662].
Darapti, [59].
Darii, [56].
Darwin, Charles, his works, [131];
negative results of observation, [413];
arguments against his theory, [437];
cultivated plants, [531];
his influence, [575];
classification, [718];
constancy of character in classification, [720–1];
on definition, [726];
restoration of limbs, [730];
tendency of his theory, [762], [764].
Davy, Sir H., on new instruments, [270];
nature of heat, [343], [417];
detection of salt in electrolysis, [428].
Day, sidereal, [310];
length of, [289].
Decandolle, on classification, [696].
Decyphering, [124].
Deduction, [11], [49].
Deductive reasoning, [534];
miscellaneous forms of, [60];
probable, [209].
Definition, [39], [62], [711], [723];
purpose of, [54];
of cause and power, [224].
De Morgan, Augustus, negative terms, [14];
Aristotle’s logic, [18];
relatives, [23];
logical universe, [43];
complex propositions, [75];
contraposition, [83];
formal logic quoted, [101];
error of his system, [117];
anagram of his name, [128];
numerically definite reasoning, [168–172];
probability, [198];
belief, [199];
experiments in probability, [207];
probable deductive arguments, [209–210];
trisection of angle, [233];
probability of inference, [259];
arcual unit, [306];
mathematical tables, [331];
personal error, [348];
average, [363];
his works on probability, [394–395];
apparent sequence, [409];
sub-equality, [480];
rule of approximation, [481];
negative areas, [529];
generalisation, [600];
double algebra, [634];
bibliography, [716];
catalogues, [716];
extensions of algebra, [758].
Density, unit of, [316];
of earth, [387];
negative, [642].
Descartes, vortices, [517];
geometry, [632].
Description, [62].
Design, [762–763].
Determinants, inference by, [50].
Development, logical, [89], [97].
Diagnosis, [708].
Dichotomy, [703].
Difference, [44];
law of, [5];
sign of, [17];
representation of, [45];
inference with, [52], [166];
form of, [158].
Differences of numbers, [185].
Differential calculus, [477].
Differential thermometer, [345].
Diffraction of light, [420].
Dimensions, theory of, [325].
Dip-needle, observation of, [355].
Direct deduction, [49].
Direction of motion, [47].
Discontinuity, [620].
Discordance, of theory and experiment, [558];
of theories, [587].
Discoveries, accidental, [529];
predicted, [536];
scope for, [752].
Discrimination, [24];
power of, [4].
Disjunctive, terms, [66];
conjunction, [67];
propositions, [66];
syllogism, [77];
argument, [106].
Dissipation of energy, [310].
Distance of statements, [144].
Divergence from average, [188].
Diversity, [156].
Divine interference, [765].
Dollond, achromatic lenses, [608].
Donkin, Professor, [375];
on probability, [199], [216];
principle of inverse method, [244].
Double refraction, [426].
Dove’s law of winds, [534].
Draper’s law, [606].
Drobitsch, [15].
Duality, [73], [81];
law of, [5], [45], [92], [97].
Dulong and Petit, [341], [471].
Duration, [308].
[E]
ε, [330], [769].
Earth, density of, [387];
ellipticity, [565].
Eclipses, [656];
Egyptian records of, [246];
of Jupiter’s satellites, [294], [372];
solar, [486].
Electric, sense, [405];
acid, [428];
fluid, [523].
Electric telegraph, anticipations of, [671].
Electricity, theories of, [522];
duality of, [590].
Electrolysis, [428], [530].
Electro-magnet, use of, [423].
Elements, confusion of, [237];
definition, [427];
classification, [676], [677], [690].
Elimination, [58].
Ellicott, observation on clocks, [455].
Ellipsis, [41];
of terms, [57].
Elliptic variation, [474].
Ellipticity of earth, [565].
Ellis, A. J., contributions to formal logic, [172].
Ellie, Leslie, [23], [375].
Ellis, W., on moon’s influence, [410].
Emanation, law of, [463].
Emotions, [732].
Empirical, knowledge, [505], [525–526];
measurement, [552].
Encke, on mean, [386], [389];
his comet, [570], [605];
on resisting medium, [523];
solar parallax, [562].
Energy, unit of, [322];
conservation of, [465];
reconcentration of, [751].
English language, words in, [175].
Eözoon canadense, [412], [668].
Equality, sign of, [14];
axiom, [163];
four meanings of, [479].
Equations, [46], [53], [160];
solution of, [123].
Equilibrium, unstable, [276], [654].
Equisetaceæ, [721].
Equivalence of propositions, [115], [120], [132];
remarkable case of, [529], [657].
Eratosthenes, sieve of, [82], [123], [139];
measurement of degree, [293].
Error, function, [330], [376], [381];
elimination of, [339], [353];
personal, [347];
law of, [374];
origin of law, [383];
verification of law, [383];
probable, [386];
mean, [387];
constant, [396];
variation of small errors, [479].
Ether, luminiferous, [512], [514], [605].
Euclid, axioms, [51], [163];
indirect proof, [84];
10th book, 117th proposition, [275];
on analogy, [631].
Euler, on certainty of inference, [238];
corpuscular theory, [435];
gravity, [463];
on ether, [514].
Everett, Professor, unit of angle, [306];
metric system, [328].
Evolution, theory of, [761].
Exact science, [456].
Exceptions, [132], [644], [728];
classification of, [645];
imaginary, [647];
apparent, [649];
singular, [652];
divergent, [655];
accidental, [658];
novel, [661];
limiting, [663];
real, [666];
unclassed, [668].
Excluded middle, law of, [6].
Exclusive alternatives, [68].
Exhaustive investigation, [418].
Expansion, of bodies, [478];
of liquids, [488].
Experiment, [400], [416];
in probability, [208];
test or blind, [433];
negative results of, [434];
limits of, [437];
collective, [445];
simplification of, [422];
failure in simplification, [424].
Experimentalist, character of, [574], [592].
Experimentum crucis, [518], [667].
Explanation, [532].
Extent of meaning, [26];
of terms, [48].
Extrapolation, [495].
[F]
Factorials, [179].
Facts, importance of false, [414];
conformity with, [516].
Fallacies, [62];
analysed by indirect method, [102];
of observation, [408].
Faraday, Michael, measurement of gold-leaf, [296];
on gravity, [342], [589];
magnetism of gases, [352];
vibrating plate, [419];
electric poles, [421];
circularly polarised light, [424], [588], [630];
freezing mixtures, [427];
magnetic experiments, [431], [434];
lines of magnetic force, [446], [580];
errors of experiment, [465];
electrolysis, [502];
velocity of light, [520];
prediction, [543];
relations of physical forces, [547];
character of, [578], [587];
ray vibrations, [579];
mathematical power, [580];
philosophic reservation of opinion, [592];
use of heavy glass, [609];
electricity, [612];
radiant matter, [642];
hydrogen, [691].
Fatality, belief in, [264].
Ferio, [56].
Figurate numbers, [183], [186].
Figure of earth, [459], [565].
Fizeau, use of Newton’s rings, [297], [582];
fixity of properties, [313];
velocity of light, [441], [561].
Flamsteed, use of wells, [294];
standard stars, [301];
parallax of pole-star, [338];
selection of observations, [358];
astronomical instruments, [391];
solar eclipses, [486].
Fluorescence, [664].
Fontenelle on the senses, [405].
Forbes, J. D., [248].
Force, unit of, [322], [326];
emanating, [464];
representation of, [633].
Formulæ, empirical, [487];
rational, [489].
Fortia, Traité des Progressions, [183].
Fortuitous coincidences, [261].
Fossils, [661].
Foster, G. C., on classification, [691].
Foucault, rotating mirror, [299];
pendulum, [342], [431], [522];
on velocity of light, [441], [521], [561].
Fourier, Joseph, theory of dimensions, [325];
theory of heat, [469], [744].
Fowler, Thomas, on method of difference, [439];
reasoning from case to case, [227].
Frankland, Professor Edward, on spectrum of gases, [606].
Franklin’s experiments on heat, [424].
Fraunhofer, dark lines of spectrum, [429].
Freezing-point, [546].
Freezing mixtures, [546].
Fresnel, inflexion of light, [420];
corpuscular theory, [521];
on use of hypothesis, [538];
double refraction, [539].
Friction, [417];
determination of, [347].
Function, definitions of, [489].
Functions, discovery of, [496].
[G]
Galileo, [626];
on cycloid, [232], [235];
differential method of observation, [344];
projectiles, [447], [466];
use of telescope, [522];
gravity, [604];
principle of continuity, [617].
Gallon, definition of, [318].
Galton, Francis, divergence from mean, [188];
works by, [188], [655];
on hereditary genius, [385], [655].
Galvanometer, [351].
Ganières, de, [182].
Gases, [613];
properties of, [601], [602];
perfect, [470];
liquefiable, [665].
Gauss, pendulum experiments, [316];
law of error, [375–6];
detection of error, [396];
on gravity, [463].
Gay Lussac, on boiling point, [659];
law of, [669].
Genealogical classification, [680], [719].
General, terms, [29];
truths, [647];
notions, [673].
Generalisation, [2], [594], [704];
mathematical, [168];
two meanings of, [597];
value of, [599];
hasty, [623].
Genius, nature of, [575].
Genus, [433], [698];
generalissimum, [701];
natural, [724].
Geology, [667];
records in, [408];
slowness of changes, [438];
exceptions in, [660].
Geometric mean, [361].
Geometric reasoning, [458];
certainty of, [267].
Giffard’s injector, [536].
Gilbert, on rotation of earth, [249];
magnetism of silver, [431];
experimentation, [443].
Gladstone, J. H., [445].
Glaisher, J. W. L., on mathematical tables, [331];
law of error, [375], [395].
Gold, discovery of, [413].
Gold-assay process, [434].
Gold-leaf, thickness of, [296].
Graham, Professor Thomas, on chemical affinity, [614];
continuity, [616];
nature of hydrogen, [691].
Grammar, [39];
rules of, [31].
Grammatical, change, [119];
equivalence, [120].
Gramme, [317].
Graphical method, [492].
Gravesande, on inflection of light, [420].
Gravity, [422], [512], [514], [604], [740];
determination of, [302];
elimination of, [427];
law of, [458], [462], [474];
inconceivability of, [510];
Newton’s theory, [555];
variation of, [565];
discovery of law, [581];
Faraday on, [589];
discontinuity in, [620];
Aristotle on, [649];
Hooke’s experiment, [436].
Grimaldi on the spectrum, [584].
Grove, Mr. Justice, on ether, [514];
electricity, [615].
Guericke, Otto von, [432].
[H]
Habit, formation of, [618].
Halley, trade-winds, [534].
Halley’s comet, [537], [570].
Hamilton, Sir William, disjunctive propositions, [69];
inference, [118];
free-will, [223].
Hamilton, Sir W. Rowan, on conical refraction, [540];
quaternions, [634].
Harley, Rev. Robert, on Boole’s logic, [23], [155].
Harris, standards of length, [312].
Hartley, on logic, [7].
Hatchett, on alloys, [191].
Haughton, Professor, on tides, [450];
muscular exertion, [490].
Haüy, on crystallography, [529].
Hayward, R. B., [142].
Heat, unit of, [324];
measurement of, [349];
experiments on, [444];
mechanical equivalent of, [568].
Heavy glass, [588], [609].
Helmholtz, on microscopy, [406];
undulations, [414];
sound, [476].
Hemihedral crystals, [649].
Herschel, Sir John, on rotation of plane of polarisation of light, [129], [630];
quartz crystals, [246];
numerical precision, [273];
photometry, [273];
light of stars, [302];
actinometer, [337];
mean and average, [363];
eclipses of Jupiter’s satellites, [372];
law of error, [377];
error in observations, [392];
on observation, [400];
moon’s influence on clouds, [410];
comets, [411];
spectrum analysis, [429];
collective instances, [447];
principle of forced vibrations, [451], [663];
meteorological variations, [489];
double stars, [499], [685];
direct action, [502];
use of theory, [508];
ether, [515];
experimentum crucis, [519];
interference of light, [539];
interference of sound, [540];
density of earth, [567];
residual phenomena, [569];
helicoidal dissymmetry, [630];
fluorescence, [664].
Hindenburg, on combinatorial analysis, [176].
Hipparchus, used method of repetition, [289];
longitudes of stars, [294].
Hippocrates, area of lunule, [480].
History, science of, [760].
Hobbes, Thomas, definition of cause, [224];
definition of time, [307];
on hypothesis, [510].
Hofmann, unit called crith, [321];
on prediction, [544];
on anomalies, [670].
Homogeneity, law of, [159], [327].
Hooke, on gravitation, [436], [581];
philosophical method, [507];
on strange things, [671].
Hopkinson, John, [194];
method of interpolation, [497].
Horrocks, use of mean, [358];
use of hypothesis, [507].
Hume on perception, [34].
Hutton, density of earth, [566].
Huxley, Professor Thomas, [764];
on hypothesis, [509];
classification, [676];
mammalia, [682];
palæontology, [682].
Huyghens, theory of pendulum, [302];
pendulum standard, [315];
cycloidal pendulum, [341];
differential method, [344];
distant stars, [405];
use of hypothesis, [508];
philosophical method of, [585];
on analogy, [639].
Hybrids, [727].
Hydrogen, expansion of, [471];
refractive power, [527];
metallic nature of, [691].
Hygrometry, [563].
Hypotheses, use of, [265], [504];
substitution of simple hypotheses, [458];
working hypotheses, [509];
requisites of, [510];
descriptive, [522], [686];
representative, [524];
probability of, [559].
[I]
Identical propositions, [119].
Identities, simple, [37];
partial, [40];
limited, [42];
simple and partial, [111];
inference from, [51], [55].
Identity, law of, [5], [6], [74];
expression of, [14];
propagating power, [20];
reciprocal, [46].
Illicit process, of major term, [65], [103];
of minor term, [65].
Immediate inference, [50], [61].
Imperfect induction, [146], [149].
Inclusion, relation of, [40].
Incommensurable quantities, [275].
Incompossible events, [205].
Independence of small effects, [475].
Independent events, [204].
Indestructibility of matter, [465].
Indexes, classification by, [714];
formation of, [717].
India-rubber, properties of, [545].
Indirect method of deduction, [49], [81];
illustrations of, [98];
fallacies analysed by, [102];
the test of equivalence, [115].
Induction, [11], [121];
symbolic statement of, [131];
perfect, [146];
imperfect, [149];
philosophy of, [218];
grounds of, [228];
illustrations of, [229];
quantitative, [483];
problem of two classes, [134];
problem of three classes, [137].
Inductive truths, classes of, [219].
Inequalities, reasoning by, [47], [163], [165–166].
Inference, [9];
general formula of, [17];
immediate, [50];
with two simple identities, [51];
from simple and partial identity, [53];
with partial identities, [55];
by sum of predicates, [61];
by disjunctive propositions, [76];
indirect method of, [81];
nature of, [118];
principle of mathematical, [162];
certainty of, [236].
Infima species, [701], [702].
Infiniteness of universe, [738].
Inflection of light, [420].
Instantiæ, citantes, evocantes, radii, curriculi, [270];
monodicæ, irregulares, heteroclitæ, [608];
clandestinæ, [610].
Instruments of measurement, [284].
Insufficient enumeration, [176].
Integration, [123].
Intellect, etymology of, [5].
Intension of logical terms, [26], [48];
of propositions, [47].
Interchangeable system, [20].
Interpolation, [495];
in meteorology, [497].
Inverse, process, [12];
operation, [122], [689];
problem of two classes, [134];
problem of three classes, [137];
problem of probability, [240], [251];
rules of inverse method, [257];
simple illustrations, [253];
general solution, [255].
Iodine, the substance X, [523].
Iron, properties of, [528], [670].
Is, ambiguity of verb, [16], [41].
Isomorphism, [662].
Ivory, [375].
[J]
James, Sir H., on density of earth, [567].
Jenkin, Professor Fleming, [328].
Jevons, W. S., on use of mean, [361];
on pedesis or molecular movement of microscopic particles, [406], [549];
cirrous clouds, [411];
spectrum analysis, [429];
elevated rain-gauges, [430];
experiments on clouds, [447];
on muscular exertion, [490];
resisting medium, [570];
anticipations of the electric telegraph, [671].
Jones, Dr. Bence, Life of Faraday, [578].
Jordanus, on the mean, [360].
Joule, [545];
on thermopile, [299], [300];
mechanical equivalent of heat, [325], [347], [568];
temperature of air, [343];
rarefaction, [444];
on Thomson’s prediction, [543];
molecular theory of gases, [548];
friction, [549];
thermal phenomena of fluids, [557].
Jupiter, satellites of, [372], [458], [638], [656];
long inequality of, [455];
figure of, [556].
[K]
Kames, Lord, on bifurcate classification, [697].
Kant, disjunctive propositions, [69];
analogy, [597];
doctrine of space, [769].
Kater’s pendulum, [316].
Keill, law of emanating forces, [464];
axiom of simplicity, [625].
Kepler, on star-discs, [390];
comets, [408];
laws of, [456];
refraction, [501];
character of, [578].
Kinds of things, [718].
King Charles and the Royal Society, [647].
Kirchhoff, on lines of spectrum, [245].
Kohlrausch, rules of approximate calculation, [479].
[L]
Lagrange, formula for interpolation, [497];
accidental discovery, [531];
union of algebra and geometry, [633].
Lambert, [15].
Lamont, [452].
Language, [8], [628], [643].
Laplace, on probability, [200], [216];
principles of inverse method, [242];
solution of inverse problem, [256];
planetary motions, [249], [250];
conjunctions of planets, [293];
observation of tides, [372];
atmospheric tides, [367];
law of errors, [378];
dark stars, [404];
hyperbolic comets, [407];
his works on probability, [395];
velocity of gravity, [435];
stability of planetary system, [448], [746];
form of Jupiter, [556];
corpuscular theory, [521];
ellipticity of earth, [565];
velocity of sound, [571];
analogy, [597];
law of gravity, [615];
inhabitants of planets, [640];
laws of motion, [706];
power of science, [739].
Lavoisier, mistaken inference of, [238];
pyrometer, [287];
on experiments, [423];
prediction of, [544];
theory, [611];
on acids, [667]
Law, [3];
of simplicity, [33], [72], [161];
commutativeness, [35], [160];
disjunctive relation, [71];
unity, [72], [157], [162];
identity, [74];
contradiction, [74], [82];
duality, [73], [74], [81], [97], [169];
homogeneity, [159];
error, [374];
continuity, [615];
of Boyle, [619];
natural, [737].
Laws, of thought, [6];
empirical mathematical, [487];
of motion, [617];
of botanical nomenclature, [727];
natural hierarchy of, [742].
Least squares, method of, [386], [393].
Legendre, on geometry, [275];
rejection of observations, [391];
method of least squares, [377].
Leibnitz, [154], [163];
on substitution, [21];
propositions, [42];
blunder in probability, [213];
on Newton, [515];
continuity, [618].
Leslie, differential thermometer, [345];
radiating power, [425];
on affectation of accuracy, [482].
Letters, combinations of, [193].
Leverrier, on solar parallax, [562].
Lewis, Sir G. C., on time, [307].
Life is change, [173].
Light, intensity of, [296];
unit, [324];
velocity, [535], [560], [561];
science of, [538];
total reflection, [650];
waves of, [637];
classification of, [731].
Lighthouses, Babbage on, [194].
Limited identities, [42];
inference of 59.
Lindsay, Prof. T. M., [6], [21].
Linear variation, [474].
Linnæus on synopsis, [712];
genera and species, [725].
Liquid state, [601], [614].
Locke, John, on induction, [121];
origin of number, [157];
on probability, [215];
the word power, [221].
Lockyer, J. Norman, classification of elements, [676].
Logarithms, [148];
errors in tables, [242].
Logic, etymology of name, [5].
Logical abacus, [104].
Logical alphabet, [93], [116], [173], [417], [701];
table of, [94];
connection with arithmetical triangle, [189];
in probability, [205].
Logical conditions, numerical meaning of, [171].
Logical machine, [107].
Logical relations, number of, [142].
Logical slate, [95].
Logical truths, certainty of, [153].
Lottery, the infinite, [2].
Lovering, Prof., on ether, [606].
Lubbock and Drinkwater-Bethune, [386], [395].
Lucretius, rain of atoms, [223], [741];
indestructibility of matter, [622].
[M]
Machine, logical, [107].
Macleay, system of classification, [719].
Magnetism of gases, [352].
Mallet, on earthquakes, [314].
Malus, polarised light, [530].
Mammalia, characters of, [681].
Manchester Literary and Philosophical Society, papers quoted, [137], [143], [168].
Mansel, on disjunctive propositions, [69].
Mars, white spots of, [596].
Maskelyne, on personal error, [347];
deviation of plumbline, [369];
density of earth, [566].
Mass, unit of, [317], [325].
Mathematical science, [767];
incompleteness of, [754].
Matter, uniform properties of, [603];
variable properties, [606].
Matthiessen, [528].
Maximum points, [371].
Maxwell, Professor Clerk, on the balance, [304];
natural system of standards, [311], [319];
velocity of electricity, [442];
on Faraday, [580];
his book on Matter and Motion, [634].
Mayer, proposed repeating circle, [290];
on mechanical equivalent of heat, [568], [572].
Mean, etymology of, [359–360];
geometric, [362];
fictitious, [363];
precise, [365];
probable, [385];
rejection of, [389];
method of, [357], [554].
Mean error, [387].
Meaning, of names, [25];
of propositions, [47].
Measurement, of phenomena, [270];
methods of, [282];
instruments, [284];
indirect, [296];
accuracy of, [303];
units and standards of, [305];
explained results of, [554];
agreement of modes of, [564].
Mediate statements, [144].
Melodies, possible number of, [191].
Melvill, Thomas, on the spectrum, [429].
Membra dividentia, [68].
Metals, probable character of new, [258];
transparency, [548];
classification, [675];
density, [706].
Method, indirect, [98];
of avoidance of error, [340];
differential, [344];
correction, [346];
compensation, [350];
reversal, [354];
means, [357];
least squares, [377], [386], [393];
variations, [439];
graphical, [492];
Baconian, [507].
Meteoric streams, [372].
Meteoric cycle, [537].
Metre, [349];
error of, [314].
Metric system, [318], [323].
Michell, speculations, [212];
on double stars, [247];
Pleiades, [248];
torsion balance, [566].
Middle term undistributed, [64].
Mill, John Stuart, disjunctive propositions, [69];
induction, [121], [594];
music, [191];
probability, [200–201], [222];
supposed reform of logic, [227];
deductive method, [265], [508];
elimination of chance, [385];
joint method of agreement and difference, [425];
method of variations, [484];
on collocations, [740];
erroneous tendency of his philosophy, [752].
Miller, Prof. W. H., kilogram, [318].
Mind, powers of, [4];
phenomena of, [672].
Minerals, classification of, [678].
Minor term, illicit process of, [65].
Mistakes, [7].
Modus, tolendo ponens, [77];
ponendo tollens, [78].
Molecular movement, or pedesis, [406].
Molecules, number of, [195].
Momentum, [322], [326].
Monro, C. J., correction by, [172];
on Comte, [753].
Monstrous productions, [657].
Moon, supposed influence on clouds, [410];
atmosphere of, [434];
motions, [485];
fall towards earth, [555].
Morse alphabet, [193].
Mother of pearl, [419].
Müller, Max, on etymology of intellect, [5].
Multiplication in logic, [161].
Murphy, J. J., on disjunctive relation, [71].
Murray, introduced use of ice, [343].
Muscular susurrus, [298].
Music, possible combinations of, [191].
[N]
Names, [25];
of persons, ships, &c., [680].
Nature, [1];
laws of, [737];
uniformity of, [745].
Nebular theory, [427].
Negation, [44].
Negative arguments, [621].
Negative density, [642].
Negative premises, [63], [103].
Negative propositions, [43].
Negative results of experiment, [434].
Negative terms, [14], [45], [54], [74].
Neil on use of hypothesis, [509].
Neptune, discovery of, [537], [660].
Newton, Sir Isaac, binomial theorem, [231];
spectrum, [262], [418], [420], [424], [583];
rings of, [288], [470];
velocity of sound, [295];
wave-lengths, [297];
use of pendulum, [303];
on time, [308];
definition of matter, [316];
pendulum experiment, [348], [443], [604];
centrobaric bodies, [365];
on weight, [422];
achromatic lenses, [432];
resistance of space, [435];
absorption of light, [445];
planetary motions, [249], [457], [463], [466], [467];
infinitesimal calculus, [477];
as an alchemist, [505];
his knowledge of Bacon’s works, [507];
hypotheses non fingo, [515];
on vortices, [517];
theory of colours, [518];
corpuscular theory of light, [520];
fits of easy reflection, &c., [523];
combustible substances, [527];
gravity, [555], [650];
density of earth, [566];
velocity of sound, [571];
third law of motion, [622];
his rules of philosophising, [625];
fluxions, [633];
theory of sound, [636];
negative density, [642];
rays of light having sides, [662].
Newtonian Method, [581].
Nicholson, discovery of electrolysis, [530].
Ninth Bridgewater Treatise quoted, [743], [757].
Nipher, Professor, on muscular exertion, [490].
Noble, Captain, chronoscope, [308], [616].
Nomenclature, laws of botanical, [727].
Non-observation, arguments from, [411].
Norwood’s measurement of a degree, [272].
Nothing, [32].
Number, nature of, [153], [156];
concrete and abstract, [159], [305].
Numbers, prime, [123];
of Bernoulli, [124];
figurate, [183];
triangular, &c., [185].
Numerical abstraction, [158].
[O]
Observation, [399];
mental conditions, [402];
instrumental and sensual conditions, [404];
external conditions, [407].
Obverse statements, [144].
Ocean, depth of, [297].
Odours, [732].
Oersted, on electro-magnetism, [530], [535].
Or, meaning of, [70].
Order, of premises, [114];
of terms, [33].
Orders of combinations, [194].
Original research, [574].
Oscillation, centre of, [364].
Ostensive instances, [608].
Ozone, [663].
[P]
π, value of, [234], [529].
Pack of cards, arrangement of, [241].
Paley on design, [762], [763].
Parallax, of stars, [344];
of sun, [560].
Parallel forces, [652].
Paralogism, [62].
Parity of reasoning, [268].
Partial identities, [40], [55], [57], [111];
induction of, [130].
Particular quantity, [56].
Particulars, reasoning from, [227].
Partition, [29].
Pascal, [176];
arithmetical machine, [107];
arithmetical triangle, [182];
binomial formula, [182];
error in probabilities, [213];
barometer, [519].
Passive state of steel, [659].
Pedesis, or molecular movement of microscopic particles, [406], [612].
Peirce, Professor, [23];
on rejection of observations, [391].
Pendulum, [290], [302], [315];
faults of, [311];
vibrations, [453], [454];
cycloidal, [461].
Perfect induction, [146], [149].
Perigon, [306].
Permutations, [173], [178];
distinction from combinations, [177].
Personal error, [347].
Photometry, [288].
Physiology, exceptions in, [666].
Planets, conjunctions of, [181], [187], [657];
discovery of, [412];
motions, [457];
perturbations of, [657];
classification, [683];
system of, [748].
Plants, classification of, [678].
Plateau’s experiments, [427].
Plato on science, [595].
Plattes, Gabriel, [434], [438].
Pliny on tides, [451].
Plumb-line, divergence of, [461].
Plurality, [29], [156].
Poinsot, on probability, [214].
Poisson, on principle of the inverse method, [244];
work on Probability, [395];
Newton’s rings, [470];
simile of ballot box, [524].
Polarisation, [653];
discovery of, [530].
Pole-star, [652];
observations of, [366].
Poles, of magnets, [365];
of battery, [421].
Political economy, [760].
Porphyry, on the Predicables, [698];
tree of, [702].
Port Royal logic, [22].
Positive philosophy, [760], [768].
Pouillet’s pyrheliometer, [337].
Powell, Baden, [623];
on planetary motions, [660].
Power, definition of, [224].
Predicables, [698].
Prediction, [536], [739];
in science of light, [538];
theory of undulations, [540];
other sciences, [542];
by inversion of cause and effect, [545].
Premises, order of, [114].
Prime numbers, [123], [139];
formula for, [230].
Principia, Newton’s, [581], [583].
Principle, of probability, [200];
inverse method, [242];
forced vibrations, [451];
approximation, [471];
co-existence of small vibrations, [476];
superposition of small effects, [476].
Probable error, [555].
Probability, etymology of, [197];
theory of, [197];
principles, [200];
calculations, [203];
difficulties of theory, [213];
application of theory, [215];
in induction, [219];
in judicial proceedings, [216];
works on, [394];
results of law, [656].
Problems, to be worked by reader, [126];
inverse problem of two classes, [135];
of three classes, [137].
Proclus, commentaries of, [232].
Proctor, R. A., star-drifts, [248].
Projectiles, theory of, [466].
Proper names, [27].
Properties, generality of, [600];
uniform, [603];
extreme instances, [607];
correlation, [681].
Property, logical, [699];
peculiar, [699].
Proportion, simple, [501].
Propositions, [36];
negative, [43];
conversion of, [46];
twofold meaning, [47];
disjunctive, [66];
equivalence of, [115];
identical, [119];
tautologous, [119].
Protean verses, [175].
Protoplasm, [524], [764].
Prout’s law, [263], [464].
Provisional units, [323].
Proximate statements, [144].
Pyramidal numbers, [185].
Pythagoras, on duality, [95];
on the number seven, [262], [624].
[Q]
Quadric variation, [474].
Qualitative, reasoning, [48];
propositions, [119].
Quantification of predicate, [41].
Quantitative, reasoning, [48];
propositions, [119];
questions, [278];
induction, [483].
Quantities, continuous, [274];
incommensurable, [275].
Quaternions, [160], [634].
Quetelet, [188];
experiment on probability, [208];
on mean and average, [363];
law of error, [378], [380];
verification of law of error, [385].
[R]
Radian, [306].
Radiant matter, [642].
Radiation of heat, [430].
Radiometer, [435].
Rainbow, theory of, [526], [533].
Rainfall, variation of, [430].
Ramean tree, [703], [704].
Ramsden’s balance, [304].
Rankine, on specific heat of air, [557];
reconcentration of energy, [751].
Rational formulæ, [489].
Rayleigh, Lord, on graphical method, [495].
Reasoning, arithmetical, [167];
numerically definite, [168];
geometrical, [458].
Recorde, Robert, [15].
Reduction, of syllogisms, [85];
ad absurdum, [415];
of observations, [552], [572].
Reflection, total, [650].
Refraction, atmospheric, [340], [356], [500];
law of, [501];
conical, [540];
double, [585].
Regnault, dilatation of mercury, [342];
measurement of heat, [350];
exact experiment, [397];
on Boyle’s law, [468], [471];
latent heat of steam, [487];
graphical method, [494];
specific heat of air, [557].
Reid, on bifurcate classification, [697].
Reign of law, [741], [759].
Rejection of observations, [390].
Relation, sign of, [17];
logic of, [22];
logical, [35];
axiom of, [164].
Repetition, method of, [287], [288].
Representative hypotheses, [524].
Reproduction, modes of, [730].
Reservation of judgment, [592].
Residual effects, [558];
phenomena, [560], [569].
Resisting medium, [310], [523], [570].
Resonance, [453].
Reusch, on substitution, [21].
Reversal, method of, [354].
Revolution, quantity of, [306].
Robertson, Prof. Croom, [27], [101].
Robison, electric curves, [446].
Rock-salt, [609].
Rœmer, divided circle, [355];
velocity of light, [535].
Roscoe, Prof., photometrical researches, [273];
solubility of salts, [280];
constant flame, [441];
absorption of gases, [499];
vanadium, [528];
atomic weight of vanadium, [392], [649].
Rousseau on geometry, [233].
Rules, of inference, [9], [17];
indirect method of inference, [89];
for calculation of combinations, [180];
of probabilities, [203];
of inverse method, [257];
for elimination of error, [353].
Rumford, Count, experiments on heat, [343], [350], [467].
Ruminants, Cuvier on, [683].
Russell, Scott, on sound, [541].
[S]
Sample, use of, [9].
Sandeman, on perigon, [306];
approximate arithmetic, [481].
Saturn, motions of satellites, [293];
rings, [293].
Schehallien, attraction of, [369], [566].
Schottus, on combinations, [179].
Schwabe, on sun-spots, [452].
Science, nature of, [1], [673].
Selenium, [663], [670].
Self-contradiction, [32].
Senior’s definition of wealth, [75].
Senses, fallacious indications of, [276].
Seven, coincidences of number, [262];
fallacies of, [624].
Sextus, fatality of name, [264].
Sieve of Eratosthenes, [82], [123], [139].
Similars, substitution of, [17].
Simple identity, [37], [111];
inference of, [58];
contrapositive, [86];
induction of, [127].
Simple statement, [143].
Simplicity, law of, [33], [58], [72].
Simpson, discovery of property of chloroform, [531].
Simultaneity of knowledge, [34].
Singular names, [27];
terms, [129].
Siren, [10], [298], [421].
Slate, the logical, [95].
Smeaton’s experiments, on water-wheels, [347];
windmills, [401], [441].
Smee, Alfred, logical machines, [107].
Smell, delicacy of, [437].
Smithsonian Institution, [329].
Smyth, Prof. Piazzi, [452].
Socrates, on the sun, [611].
Solids, [602].
Solubility of salts, [279].
Some, the adjective, [41], [56].
Sorites, [60].
Sound, observations on, [356];
undulations, [405], [421];
velocity of, [571];
classification of sounds, [732].
Space, relations of, [220].
Species, [698];
infima, [701];
natural, [724].
Specific gravities, [301];
heat of air, [557].
Spence, on boiling point, [546].
Spencer, Herbert, nature of logic, [4], [7];
sign of equality, [15];
rhythmical motion, [448];
abstraction, [705];
philosophy of, [718], [761], [762].
Spectroscope, [437].
Spectrum, [583].
Spiritualism, [671].
Spontaneous generation, [432].
Standards of measurement, [305];
the bar, [312];
terrestrial, [314];
pendulum, [315];
provisional, [318];
natural system, [319].
Stars, discs of, [277];
motions of, [280], [474];
variations of, [281];
approach or recess, [298];
standard stars, [301];
apparent diameter, [390];
variable, [450];
proper motions, [572];
Bruno on, [639];
new, [644];
pole-star, [652];
conflict with wandering stars, [748].
Stas, M., his balance, [304];
on atomic weights, [464].
Statements, kinds of, [144].
Statistical conditions, [168].
Stevinus, on inclined plane, [622].
Stewart, Professor Balfour, on resisting medium, [570];
theory of exchanges, [571].
Stifels, arithmetical triangle, [182].
Stokes, Professor, on resistance, [475];
fluorescence, [664].
Stone, E. J., heat of the stars, [370];
temperature of earth’s surface, [452];
transit of Venus, [562].
Struve on double stars, [247].
Substantial terms, [28].
Substantives, [14].
Substitution of similars, [17], [45], [49], [104], [106];
anticipations of, [21].
Substitutive weighing, [345].
Sui generis, [629], [728].
Sulphur, [670].
Summum genus, [93], [701].
Sun, distance, [560];
variations of spots, [452].
Superposition, of small effects, [450];
small motions, [476].
Swan, W., on sodium light, [430].
Syllogism, [140];
moods of, [55], [84], [85], [88], [105], [141];
numerically definite, [168].
Symbols, use of, [13], [31], [32];
of quantity, [33].
Synthesis, [122];
of terms, [30].
[T]
Table-turning, [671].
Tacit knowledge, [43].
Tacquet on combinations, [179].
Tait, P. G., [375];
theory of comets, [571].
Talbot on the spectrum, [429].
Tartaglia on projectiles, [466].
Tastes, classification of, [732].
Tautologous propositions, [119].
Teeth, use in classification, [710].
Temperature, variations of, [453].
Tension of aqueous vapour, [500].
Terms, [24];
abstract, [27];
substantial, [28];
collective, [29];
synthesis of, [30];
negative, [45].
Terrot, Bishop, on probability, [212].
Test experiments, [347], [433].
Tetractys, [95].
Thales, predicted eclipse, [537].
Theory, results of, [534];
facts known by, [547];
quantitative, [551];
of exchanges, [571];
freedom of forming, [577];
of evolution, [761].
Thermometer, differential, [345];
reading of, [390];
change of zero, [390].
Thermopile, [300].
Thomas, arithmetical machine, [107].
Thomson, Archbishop, [50], [61].
Thomson, James, prediction by, [542];
on gaseous state, [654].
Thomson, Sir W., lighthouse signals, [194];
size of atoms, [195];
tides, [450];
capillary attraction, [614];
magnetism, [665];
dissipation of energy, [744].
Thomson and Tait, chronometry, [311];
standards of length, [315];
the crowbar, [460];
polarised light, [653].
Thomson, Sir Wyville, [412].
Thunder-cloud, [612].
Tides, [366], [450], [476], [541];
velocity of, [298];
gauge, [368];
atmospheric, [367], [553].
Time, [220];
definition of, [307].
Todhunter, Isaac, History of the Theory of Probability, [256], [375], [395];
on insoluble problems, [757].
Tooke, Horne, on cause, [226].
Torricelli, cycloid, [235];
his theorem, [605];
on barometer, [666].
Torsion balance, [272], [287].
Transit of Venus, [294], [348], [562].
Transit-circle, [355].
Tree of Porphyry, [702];
of Ramus, [703].
Triangle, arithmetical, [93], [182].
Triangular numbers, [185].
Trigonometrical survey, [301];
calculations of, [756].
Trisection of angles, [414].
Tuning-fork, [541].
Tycho Brahe, [271];
on star discs, [277];
obliquity of earth’s axis, [289];
circumpolar stars, [366];
Sirius, [390].
Tyndall, Professor, on natural constants, [328];
magnetism of gases, [352];
precaution in experiments, [431];
use of imagination, [509];
on Faraday, [547];
magnetism, [549], [607];
scope for discovery, [753].
Types, of logical conditions, [140], [144];
of statements, [145];
classification by, [722].
[U]
Ueberweg’s logic, [6].
Ultimate statements, [144].
Undistributed, attribute, [40];
middle term, [64], [103].
Undulations, of light, [558];
analogy in theory of, [635].
Undulatory theory, [468], [520], [538], [540];
inconceivability of, [510].
Unique objects, [728].
Unit, definition of, [157];
groups, [167];
of measurement, [305];
arcual, [306];
of time, [307];
space, [312];
density, [316];
mass, [317];
subsidiary, [320];
derived, [321];
provisional, [323];
of heat, [325];
magnetical and electrical units, [326], [327].
Unity, law of, [72].
Universe, logical, [43];
infiniteness of, [738];
heat-history of, [744], [749];
possible states of, [749].
Uranus, anomalies of, [660].
[V]
Vacuum, Nature’s abhorrence of, [513].
Vapour densities, [548].
Variable, variant, [440], [441], [483].
Variation, linear, elliptic, &c., [474];
method of, [439].
Variations, logical, [140];
periodic, [447];
combined, [450];
integrated, [452];
simple proportional, [501].
Variety, of nature, [173];
of nature and art, [190];
higher orders of, [192].
Velocity, unit of, [321].
Venn, Rev. John, logical problem by, [90];
on Boole, [155];
his work on Logic of Chance, [394].
Venus, [449];
transits of, [294].
Verses, Protean, [175].
Vibrations, law of, [295];
principle of forced, [451];
co-existence of small, [476].
Vital force, [523].
Voltaire on fossils, [661].
Vortices, theory of, [513], [517].
Vulcan, supposed planet, [414].
[W]
Wallis, [124], [175].
Water, compressibility of, [338];
properties of, [610].
Watt’s parallel motion, [462].
Waves, [599], [635];
nature of, [468];
in canals, [535];
earthquake, [297].
Weak arguments, effect of, [211].
Wells, on dew, [425].
Wenzel, on neutral salts, [295].
Whately, disjunctive propositions, [69];
probable arguments, [210].
Wheatstone, cipher, [124];
galvanometer, [286];
revolving mirror, [299], [308];
kaleidophone, [445];
velocity of electricity, [543].
Whewell, on tides, [371], [542];
method of least squares, [386].
Whitworth, Sir Joseph, [304], [436].
Whitworth, Rev. W. A., on Choice and Chance, [395].
Wilbraham, on Boole, [206].
Williamson, Professor A. W., chemical unit, [321];
prediction by, [544].
Wollaston, the goniometer, [287];
light of moon, [302];
spectrum, [429].
Wren, Sir C., on gravity, [581].
[X]
X, the substance, [523].
[Y]
Yard, standard, [397].
Young, Dr. Thomas, tension of aqueous vapour, [500];
use of hypotheses, [508];
ethereal medium, [515].
[Z]
Zero point, [368].
Zodiacal light, [276].
Zoology, [666].

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