I.
[Ideas], Plato’s, differ from Pythagorean Number, i. [10];
identified by Plato with the Pythagorean symbols, [348], iii. [71 n.], [368];
differ from Demokritean atoms, i. [72];
the definitions Sokrates sought for, [453];
Plato assumed the common characteristic, by objectivising the word itself, [ ib.];
doctrine derived its plausibility from metaphors, [343];
soul’s immortality rests on assumption of, ii. [412];
reminiscence of the, iii. [13];
as Forms, ii. [412];
the only causes, [396];
formal, [408 n.];
logical phantoms as real causes, [404 n.];
truth resides in, [411];
alone exclude contrary, [7 n.];
unchangeable, iii. [246 n.], iv. [50];
Herakleitean flux not true of, iii. [320];
partly changeable and partly unchangeable, [228];
disguised in particulars, iv. [3 n.];
fundamental distinction of particulars, and, [219];
alone knowable, [49];
opinion, of what is between ens and non-ens, [ib.];
assumption of, as separate entia, ii. [396], [403];
great multitude of, [410];
characteristics of world of, iii. [63];
Ideas separate from, but participable by, sensible objects, [59];
objections, [ 60-7];
the genuine Platonic theory attacked, [68];
none of some objects, [60];
how participable by objects, [63], [65], [72], iv. [138];
not fitted on to the facts of sense, iii. [78];
Aristotle partly successful in attempt, [76].;
analogous difficulty of predication, i. [169];
“the third man,” iii. [64 n.];
not merely conceptions, [64], [73];
not mere types, [65];
not cognizable, since not relative to ourselves, [ib.], [72];
gods have Idea of cognition, [67], [68 n.];
dilemma, ideas exist or philosophy impossible, [68];
intercommunion of some forms, [207], [250 n.];
analogy of letters and syllables, [208];
what forms, determined by philosopher, [ ib.];
of non-ens, and proposition, opinion, judgment, [213], [214];
of Diversum pervades all others, [209];
τῶν ἀποφάσεων, [238 n.];
of Animal, iv. [223], [235 n.], [263];
kosmos on pattern of, [223];
action on Materia Prima, [238];
of the elements, [239];
of insects, &c., iii. [195 n.];
of names and things nameable, [286 n.], [289], [326 n.];
names fabricated by lawgiver on type of, [287], [290], [325];
names the essence of things, [324 n.];
doctrine about classification not necessarily connected with, [345];
of Beauty exclusively presented in Symposion, [18];
of Good, approximation of primum amabile, ii. [192];
training to ascend to the idea of good, iv. [61], [66];
comparison of idea of good to sun, [63], [64];
of Good, in Phædon, Anaxagoras’ nous, ii. [412];
known to the rulers alone, iv. [212];
left unsolved, [213];
the contemplation of, by dialectic, [75];
reluctance to undertake active duties, of those who have contemplated, [70];
philosopher lives in region of, sophist in region of non-ens, iii. [208], iv. [48];
little said of, in Menon, ii. [253], [254 n.];
postulated in Timæus, iv. [220];
discrepancy of Sophistês and other dialogues, iii. [244];
the idealists’ doctrine the same as Plato’s in Phædon, &c., [ib.], [246];
Phædrus, Phædon, and Timæus compared, iv. [239 n.];
Plato’s various views, ii. [404], i. [119];
the last, [120];
Aristotle on, [360 n.], ii. [192], [193 n.], [410 n.], iii. [76], [245], [365 n.], [367], iv. [214 n.], i. [120 n.];
Sophistês approximates to Aristotle’s view, iii. [247];
generic and analogical aggregates, ii. [48], [193 n.], iii. [365];
Antisthenes and Diogenes on, i. [163];
the first protest of Nominalism against Realism, [164];
see [Particulars], [Phenomena], [Universal].
[Ideal], to Plato the only real, ii. [89].
[Idealists], iii. [201];
meaning of ens, [231];
argument against, [204], [225], [244];
doctrine of, the same as Plato’s in Phædon, &c., [ ib.], [246].
[Identity], personal, ii. [11], [25], iii. [6];
and contradiction, principle of, [101].
Ἰδιώτης distinguished from φιλόσοφος, iv. [104 n.];
τεχνίτης, ii. [272 n.]
[Ignorance], mischiefs of, ii. [12];
depend on the subject-matter, [14];
to hurt knowingly, better than ignorantly, [58], [59];
evil done by bad man unwillingly, by good wilfully, [61];
not pleasure, the cause of wrongdoing, [294];
mistaking itself for knowledge, the worst evil, iii. [197];
see [Knowledge].
[Imitator], logical classification of, iii. [215];
of the wise man, sophist is, [216];
poets’ mischievous imitation of imitation, iv. [91].
[Immortality], beliefs as to partial, ii. [385 n.];
popular Greek belief, [427];
metempsychosis a general element in all old doctrines, [425 n.];
of rational soul only, iv. [243];
of all three parts of soul? ii. [385];
Plato’s demonstration rests on assumption of ideas, [412];
includes pre-existence of all animals, and metempsychosis, [414];
fails, [423], [428], iii. [15];
leaves undetermined mode of pre-existence and post-existence, ii. [424];
was not generally accepted, [426];
Xenophon’s doctrine, [420 n.];
Aristotle’s, [ ib.];
common desire for, iii. [6];
attained through mental procreation, beauty the stimulus, [ib.];
only metaphorical in Symposion, [17].
[Indeterminate], Pythagorean doctrine of the, i. [11];
pleasure the, iii. [348];
see [Infinite].
[Indian] philosophy, compared with Greek, i. [107], [378 n.], [160 n.], [162];
analogy of Plato’s doctrine of the soul, ii. [389 n.], [426 n.];
Gymnosophists, compared with Diogenes, i. [157], [160 n.];
antiquity of, [159 n.];
suicide, [162 n.];
Antisthenes did not borrow from, [159 n.];
antithesis of law and nature, [162].
[Indifferent], the, ii. [180], [189].
[Individual], analogy to kosmical process, i. [36 n.];
tripartite division of mind, iv. [37];
analogous to three classes in state, [39];
analogy to state, [11], [20], [37], [ 79-84], [96];
Hobbes on, [ ib.];
parallelism exaggerated, [114], [121], [124];
dependent on society, [21], [121], [123];
four stages of degeneracy, [79-84];
proportions of happiness and misery in them, [83];
happiness of, through justice, [20], [84], [90];
one man can do only one thing well, [23], [33], [97], [98], [183];
Xenophon on, [139 n.]
[Individualism], see [Authority].
[Inductive] and syllogistic dialectic, ii. [27];
process of, always kept in view in dialogues of search, i. [406];
illustrated in history of science, ii. [163];
trial and error the natural process of the human mind, [165];
length of Plato’s process, [100 n.];
usefulness of negative result, [186];
the mind rises from sensation to opinion, then cognition, iii. [164];
verification from experience, not recognised as necessary or possible, [168].
[Infanticide], iv. [43], [44], [177];
Aristotle on, [202];
contrast of modern sentiment, [203].
[Infinite], of Anaximander, i. [5];
reproduced in chaos of Anaxagoras, [54];
Zeno’s reductiones ad Absurdum, [93];
natural coalescence of finite and, iii. [340], [346], [348 n.];
illustration from speech and music, [341];
explanation insufficient, [343];
see [Indeterminate].
[Ingratitude], iv. [399].
[Inspiration], special, a familiar fact in Greek life, ii. [130], iii. [352], iv. [15];
in rhapsode and poet, ii. [127];
of rhapsode through medium of poets, [128], [129], [134];
of philosopher, [383];
see [Dæmon];
Plato’s view, [131];
the reason temporarily withdrawn, [132], iii. [11], [309 n.];
opposed to knowledge, ii. [136];
right opinion of good statesmen from, [241];
all existing virtue is from, [242].
[Instantaneous], Plato’s imagination of the, iii. [100];
found no favour, [102].
[Interest], forbidden, iv. [331].
Ion, authenticity, i. [306], ii. [124];
date, i. [307], [308-9], [311], [312], [315];
interlocutors, ii. [124];
Ion as a rhapsode, [126];
devoted himself to Homer, [127];
the poetic art is one, [ib.];
inspiration of rhapsodes and poets, [ib.];
inspiration of Ion through Homer, [128];
analogy of magnet, ib., [129];
Plato’s contrast of systematic with unsystematic procedure, [ ib.];
Ion does not admit his own inspiration, [132];
province of rhapsode, [ ib.];
the rhapsode the best general, [133];
exposition through divine inspiration, [134].
[Ionic] philosophy compared with the abstractions of Plato and Aristotle, i. [87];
defect of, [88];
attended to material cause only, [ib.];
see [Philosophy — Pre-Sokratic].
[Islands] of the Blest, ii. [416].
[Isokrates], probably the half-philosopher, half-politician of Euthydêmus, ii. [227], iii. [35];
variable feeling between, and Plato, ii. [228], [331 n.], iii. [36];
praised in Phædrus, [35];
compared with Lysias, ib.[38];
his school at Athens, [36];
teaching of, iv. [150 n.];
as Sophist, i. [212 n.];
teachableness of virtue, ii. [240 n.];
age for dialectic exercises, iv. [211 n.];
criticism on other philosophers, iii. [38 n.];
on aspersions of rivals, [408 n.];
on the poets, iv. [157 n.];
contrasted with Plato in Timæus, [217];
on Leges, [ 432];
oratio panegyrica, iii. [406 n.];
great age of, i. [245].