INDEX.

Absorption by red, blue, and green glasses,[53]
Absorption of light in the earth's atmosphere, [67]
Absorption, reference to law of,[53]
After-glow,[74]
Arc light,[20]
Artists and colours, [195]
Balmain's paint,[33]
Black body,[18]
Blindness to green, [142]
Blindness to red,[79-142]
Bromo-iodide of silver,[136]
Carbon poles,[20]
Carmine, light reflected from, [107]
" template,[106]
Chlorophyll, green solution of,[51]
Collimating lens, focal length of,[22]
Colour, analysis of,[52]
Colour-blind, red and green,[79] , [80]
Colour-blindness,[142-146], [157] , [159]
Colour constants,[15]
Colour equations, formation of,[147] , [148]
Colour, extinction of, by white light,[126]
Colour mixtures,[113]
Colour patch apparatus,[41-52]
Colour sensation of the eye,[202]
Coloured discs, use of,[189]
Coloured glasses, measurement of,[162]
Colours, complementary of pigments,[170-172]
Colours, complementary of spectrum,[167]
Colours, how matched,[156] , [157]
Complementary colours, measurement of,[173-178]
Compound colours, definition of,[16]
Continuous spectrum,[17]
Contrast colours,[196-200]
Diffraction gratings,[23]
" spectra,[24]
Dimness and brightness of spectrum,[29]
Discs, spinning,[182]
Dust, particles of,[62]
Electric light, contrast colours in,[197]
Electric light, crater of positive pole of,[20]
Emerald green, light reflected from,[94]
Equations, colour,[147]
Essentials of spectrum,[22]
Extraction of colour by white light,[126]
Extraction of white light by colour,[131]
Eye, sensitiveness of,[15]
Fatigue of the retina,[202]
Fluorescence,[31]
Fundamental sensations,[140]
Gamboge, matching,[189]
Glass, light from sheet of,[14]
Glass prisms,[21] , [22]
Glow-worm,[13]
Green colour-blindness,[142]
Heating effect of radiation,[38]
Hue,[15]
Images, after,[202]
Images, persistence of, on retina,[179]
Impurity of simple colours,[124]
Indicator of sectors,[48]
Infra-red rays,[32]
" photography with,[34]
Insensitiveness of the yellow spot to green,[118]
Intensities of limelight, gaslight, and blue sky compared,[110] , [121]
Interference,[58] , [59]
Interference bands on soap film,[60]
Invisible spectrum, methods for showing existence of,[32] , [33]
Kœnig's curves,[151]
Kœnig's experiments,[140]
Law of the scattering by fine particles,[66]
Light from sun, imitation of,[63]
Light, quality of, illumining object,[14]
Light scattered,[62]
Limelight,[19]
Lines in solar spectrum,[26]
Luminosity,[13]
Luminosity, addition of one to another,[85-87]
Luminosity of colour,[16]
Luminosity of pigments, methods of determining,[81] , [82]
Luminosity of spectrum to normal-eyed and colour-blind persons,[76-78]
Luminosity of sun at different altitudes,[69-71]
Maxwell's colour-box,[152] , [153]
Maxwell's discs,[184-186]
Measurement of amount of light reflected by different pigments,[88-92]
Metals, light reflected from,[100]
Mock suns, cause of change of colour in,[64]
Molecular physics,[54]
Molecular swings,[136] , [137]
Monochromatic light,[47]
Negative images,[203]
Normal vision,[77]
Orange, finding luminosity of,[190]
Percentages of skylight, sunlight, and gaslight,[110] , [111]
Phosphorescence,[32] , [56]
Pigments, absorption by,[57] , [58]
Plan of forming spectrum,[21]
Polished and uneven surfaces,[13]
Primary colours, definition of,[133-] [135]
Prism, Iceland spar,[96]
Prismatic spectrum into wave-lengths, conversion of,[28]
Prisms, drawback to use of,[23]
Prussian blue template,[107]
" " light reflected from,[107]
Purity of colour,[16]
Rays, infra-red,[34]
Rays, photography of dark,[34]
Rays, ultra-violet,[34]
Registering tint of pigments,[116]
" " colours,[156]
Retina, persistence of images on,[179]
Ritter's rays,[32]
Rood's colour scale,[26]
Rotating sectors,[46]
Scaling of spectrum,[49]
Sectors, rotating,[46]
Simple colours, how obtained,[112] , [113]
Slits placed in spectrum,[113]
Soap-bubbles,[58] , [59]
Soap-films,[59]
Spectrum, absorption of,[51] , [52]
Spectrum of sunlight,[18]
Sun, mock,[64]
Sunset clouds,[68] , [69] , [72] , [73]
Sunset sky,[72] , [73]
Thermopile, heating effects of,[36]
Thermopile, principle of,[35]
Ultramarine, light reflected from,[95]
Ultra-violet rays,[31]
Vermilion, light reflected from,[93]
Vibrations of rays per second,[55]
Violet bands, brightness of,[21]
Visible and invisible parts of spectrum,[30]
Water, particles of,[62]
Wave-length of lines in solar spectrum,[26]
White light and contrast colours,[200-202]
White light, extinction of by colour,[131]
White light, formation of by mixture of yellow and blue,[125]
White light, how made,[114] , [115] , [119-123]
White light, impression of,[81]
Yellow and blue make white,[125]
Yellow, chrome, luminosity of,[191]
Yellow spot,[117]
Young-Helmholtz theory,[138]

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