394
INDEX.
Phosphurct of ammonia formed by light,17 .
Phosphuretted hydrogen formed from phos-phorus and ammonia, 17.
Photogenic drawing of II. F. Talbot , 34.Photograph negative and positive, explained,87.
Photographic process of Thomas Wedg wood , 22.
application of nitrate of silver,61.
application of chloride of sil-ver, 64.
experiments by Mr. Talbot ,67.
application of iodide of silver,82.
application of the Ferro-cya-! nide of potassium, 93.application of bromide of sil-ver, 119.
effects produced bv absorption,355.
Photographs obliterated and restored atpleasure, 70.
positive, formed by the saltsof iodine, 95.
Planets, their light, Hoyle’s notion of, 7.Plants, influence of light on, 14.
growth of, influence of solar rays on,215.
bend to the light, 240.absorb carbonic acid, 243.phosphorescent, 275.
Platinum, 152.
Phnnbuyo auriculata , spectrum formed on,
202 .'
Polarization of the chemical rays, 332.Pomegranate, double flowering, spectrumformed on, 203.
Ponton’s, Mr., process, 185.
Positive picture explained, 86.
pictures, calotype paper used for,90.
Potash, red pvussinte of, 132.
ferrosesquieyanuret of, 168.bichromate of, used, 176.its progress towards the light, 247.Precipitates, colour of, 286.
Precipitation, influence of solar rays on,
2 H2.
Priestley’s, Dr., investigations, 14.
experiments, 207.
Prinseps, Macuire, on the colouring matterof leaves, 15.
Prints copied by juxtaposition, 261.
Prismatic analysis of sunbeam, 37.
image, condition of the, 47.analysis with nitrate of silver, 60.analysis with chlorideofsilver,63. |
Prismatic analysis with iodide of silver, 81,analysis of the ferrocyanotype,93.
analysis with darkened silverbleached by iodides, 99.analysis with Daguerreotype plate,115.
analysis with bromide of silver,
120 .
analysis with fluoride of silver,123.analysis with phosphate of silver,126.
analysis with tartrate of silver,127.
analysis with benzoate of silver,130.
analysis with collodion plate, 144.analysis with chloride of gold.147.
analysis with various salts ofgold, 149.
analysis with salts of platinum,151.
analysis with salts of mercury,159.
analysis with ferrosesquieyanuret
of potash, 169.analysis with iron salts, 169.analysis with juice of curchorusjaponica , 195.
colours impressed on photographic?
preparations, 337.spectrum examined, 344.rays, temperature of, 345.
Prisms, kind ofl employed, 60.
Protecting action of luminous rays variable,363.
Protocyanide of gold, 150.
Protosulphate of iron, a developing agent,143.
Prussian blue , decolouration of, 16.
formed in cyauotype, 168.formed in sunshine, 287.Pyrogallie acid, 143,
Pyroxylin (gun-cotton), 142.
Quinine, sulphate of, action of, on light, 43.
sulphate, solution of, its effect onlight, 315.
Radiations, dark, 263.
liuyons €xcitateum and contiuuators, 113.
Rays, three primary, 41.
complementary to vegetable colour,destroy it, 195.
Reade, Rev. J. 13., letter from, Appendix *371.
I'ed extreme ray, Herschel on, 43.
impressions obtained from red ray, 63.light, plants bend from, 240.rays, action of the, 359.