470 



INDEX. 



Chlorophyl 410 



Choroid, function of 106 



Christie on magnetism of light 192 



Circulation in animals 370 



in plants 367 



Claudet on red rays 422 



Clayton's phosphorescing diamond.. 135 



Coins, slow movement in 344 



Colored flames, nature of 63 



Congestion, explanation of. 381 



Conical refraction 117 



Conservation of force 186 



Continuous spectra of ignited solids. 32 



Cooling, law of 37 



" of the earth 50 



Correlation of force 186 



Cracks, movement of liquids in 344 



Crevice, movement of liquids in 344 



Croll on age of earth 50 



Currents, electrical, in water 351 



" in capillary tubes 345 



Cyanogen flame spectrum, analysis 

 of 55,65,67 



D. 



Daguerreotype, condition of surface. 222 



" engraving of. 229 



fading of 233 



" plate, its properties. 89 



" process of 206-208 



Dark heat rays 131 



" spaces of spectrum 124 



Darkness, spectrum of 92 



Daubeny's experiments 167 



Davy on flame 53 



Daylight in spectrum analysis. . . . 56, 91 



Deoxidizing rays 183 



Diamond, effects of heat in its phos- 

 phorescence 160 



" phosphorescence of 140 



Diffraction and dispersion spec- 

 tra 386, 416 



Diffraction spectrum, ad vantages of. . 95 

 how obtained. . 97 



laws of 120 



photograph- 

 ed.. 112,113,126 



studies in 115 



what it is 115 



Distribution of colors in spectrum... 121 



of heat in spectrum 99 



Dove, experiments of. 81 



Draper, H., on diffraction-spectrum 



photographs 125 



" " on fixed lines 80 



Dufay on Bolognian stone 161 



" on diamonds 137 



" on theory of phosphorescence. 137 



Dulong and Petit, law of cooling 37 



Dumas, experiment by 308 



Dumas, theory of substitution of. 304 



Dutrochet on bending of roots 413 



" on endosmosis 352 



Earth, age of. 50 



Eisenlohr's experiments 97 



Electric spark, interference of 454 



" its phosphorescent 



rays 321 



Electromotive power of heat 324 



Endosmosis 352 



" decompositions bv 355 



" force of. ." 362 



" force of through India- 

 rubber 359 



Engraving of daguerreotypes 22!) 



Etiolated plants turn green 410 



Eye and ear, analogies of 123 



F. 



Fading of daguerreotypes 233 



Ferric oxaiate for photographs 266 



" its properties 2(55 



Fishes, circulation in 373 



Fixed lines, atmospheric 75 



" " identification of 77 



" " nature of. 82 



" " ultra red 77 



" " ultraviolet 74 



Fixing of daguerreotype 212 



Flame and animals, analogy of. 189 



" Heumann on 60 



" passes into nonentity 190 



Flames composed of shells 59, 68 



" spectrum analyses of 52,64 



Flowers, their colors 411 



Fluorescence, spectrum examined by. 124 

 Fluor-spar, its phosphorescent quali- 

 ties 141 



Force derived from the sun 187 



" included in plants 177 



Foucault and Fizeau, their experi- 

 ments 421 



" on fixed lines 78 

 " " " on wave the- 

 ory 117 



Frankenheim on allotropism 377 



Frankland on flame 60 



Fraunhofer lines not in ignited solids. 31 

 Frequency of undulation, effect 



of 439, 452 



Fresnel on transverse vibration 116 



G. 



Gardner on bending of stems 413 



Germination of seeds. . . , 184 



Grating 35 



" Rutherfurd's 117 



Grotthus, his law 412 



