Air, absorptive power of, 357. photographic process, 87. Amaranthus, globe, spectrum formed on the, 204. Ammonia oxide of silver, 73. Amphitype, the, of Sir J. Herschel, 171. Report on the Daguerréotype, 366. Asphaltum, employed by Niepce, 31. Autumn, sunshine in, 240. Baldinus discovered phosphorescent bodies, 5. Barley, malted and unmalted, 241. Bayard, M., on pictures produced with Beccaria, Father, on phosphori, 271. Becquérel discovers dark lines of chemical his researches, 113. modifies Ponton's process, 185. on solar phosphori, 271. his experiments, 294. on the absorption of the most obtains colour on his photo- of hydruret of benzule and ni- trum, 52. on magnetic power of light, 296. Bernard on the spectrum, 41. Berres, Dr., on fixing Daguerréotypes, 109. Berzelius, on the action of light on the salts on magnetism by light, 298. Biot, M., on bromide of silver, 119. Bitumen of Judea, employed by Niepce, 31. Blackburn's theory of light, 20. Bleaching action of iodides, 96. power of spectrum, 98. Blue cobalt glass, absorptive power of, 327. Boetius de Boot on gems, 4 Boyle on the light of the planets, 7. on phosphori, 270. Brassica napus, growth of, 221. Brayley, Mr., lectures on Mr. Reade's 229. 242. Carbuncle self-luminous, 4. Cascarilla bark, change in, by light, 200 Cavendish, Mr., on air, 210. Cellini, Benvenuto, on the carbuncle, 4. glasses, absorptive power of, 306. properties of prismatic colours, Dr. Herschel's question on, 19. spectra, after absorption by ura- spectra, after absorption by qui- spectra, after absorption by red spectra, after absorption by green spectra, after absorption by blue spectrum, Berard's idea of, 21. dark lines of, 49. Coloured glasses, prismatic analysis of, 211. Colouring matter of leaves, action of, on property of cobalt, 184. Comte Auguste, on the theories of light, 345. Constitution of the spectrum, by E. Bec- Contact, effects of, 249. Continuing rays of Becquérel, 113. sulphate of, used in chromatype, 177. rendered sensitive by iron, 175. iodide of, 178. sulphate of, and bichromate of pot- glasses, green, absorptive powers of, 324. Corchorus Japonica, action of light on, 194. INDEX. Daguerre, first notice of his experiments, 24. on the production of colour, 338. Daguerreotype, the, 103. discovery of, announced, 34. Dark lines of spectrum, 48. Sir Humphry, suggests experiments on Wedgwood's ex- Day, photographic effect at different hours Decandolle on the growth of plants, 232. Dessaignes, M., on solar phosphori, 271. Dizé, crystallization of salts by light, 9. 31. Draper, Dr., on the Daguerréotype image, 114. on Möser's experiments, 253. Electrical images, 265. influences of sunshine, 291. Englefield, Sir Henry, on the heat rays on thermic spectrum, 51. of Etherial solutions of gold decomposed, 13. Faraday, on the volatilization of mercury, 106. 299. Fat becomes yellow and rancid when ex- Ferrocyanide of potassium combined with Fischer, M., action of light on salts of gold on ferrocyanides precipitated by Fishes, the depth to which they live in the Fixing processes of Mr. Talbot, 68. of Sir John Herschel, 34. Daguerréotype image, 108. Fizeau, M., on fixing Daguerréotype image, 109. Glass for Palm-House at Kew, 375. blue, absorptive powers of, 327. polariscope employed in experi- percyanide of potassium and, 151. Green, vegetable matter, Priestley's experi- |