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Air, absorptive power of, 357.
Albumen on glass used, 138.

photographic process, 87.
Alchymists observe the blacking of horn
silver, 5.

Amaranthus, globe, spectrum formed on the,

204.

Ammonia oxide of silver, 73.

Amphitype, the, of Sir J. Herschel, 171.
Analysis of the sunbeam, 36.
Ancient explanation of vision, 3.
Animal and vegetable kingdoms, 245.
Animals, phosphorescent, 274.
Aquatic plants, Priestley on, 208.
Arago, M., on the chemical rays, 351.

Report on the Daguerréotype, 366.
Archimedes knew the laws of refraction, 3.
Arsenicalis, liquor, 133.

Asphaltum, employed by Niepce, 31.
Atmospheric changes, influence of, 365.
Aurotypes, 148.

Autumn, sunshine in, 240.

Baldinus discovered phosphorescent bodies, 5.
Barium, chloride of, a colorific agent, 63.
sulphuret of, 271.

Barley, malted and unmalted, 241.
Bauer and Niepce, correspondence of, 25.
Baumgartner, M., magnetizes steel wire by
light, 297.

Bayard, M., on pictures produced with
bromide of silver, 121.

Beccaria, Father, on phosphori, 271.

Becquérel discovers dark lines of chemical
spectrum, 49.

his researches, 113.

modifies Ponton's process, 185.

on solar phosphori, 271.

his experiments, 294.

on the absorption of the most
refrangible rays, 321.

obtains colour on his photo-
graphic plates, 340.
Beetroot, spectrum on juice of, 205.
Benzoate of the oxide of silver, 129.

of hydruret of benzule and ni-
trate of silver, 131.
Berard on chemical action of sun's rays, 20.
on maximum of heat in the spec-

trum, 52.

on magnetic power of light, 296.
on the double refraction of the
chemical rays, 332.

Bernard on the spectrum, 41.

Berres, Dr., on fixing Daguerréotypes, 109.
Berthollet and Biot report on Berard's
experiments, 20.

Berzelius, on the action of light on the salts
of gold, 19.

on magnetism by light, 298.

Biot, M., on bromide of silver, 119.
his polariscope employed in ex-
periments on actinism, 335.
on vision, 347.

Bitumen of Judea, employed by Niepce, 31.
in heliography, 189.

Blackburn's theory of light, 20.

Bleaching action of iodides, 96.

power of spectrum, 98.

Blue cobalt glass, absorptive power of, 327.
Böckman on the action of spectrum on
phosphorus, 15.1

Boetius de Boot on gems, 4
Bolognian stone, 5. 271.

Boyle on the light of the planets, 7.

on phosphori, 270.

Brassica napus, growth of, 221.

Brayley, Mr., lectures on Mr. Reade's

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229. 242.

Carbuncle self-luminous, 4.

Cascarilla bark, change in, by light, 200
Catalysotype, the, 135.

Cavendish, Mr., on air, 210.

Cellini, Benvenuto, on the carbuncle, 4.
Channing simplifies calotype process, 89.
Chaptal on Vegetation of salts, 9.
Charcoal, action of, on silver solutions, 59.

glasses, absorptive power of, 306.
Charles, M., supposed discovery of photo-
graphy by, denied, 22.
Cheiranthus cheiri, action of light on, 197.
Chemical combination, influence of solar
rays on, 276.

properties of prismatic colours,

Dr. Herschel's question on, 19.
rays, by M. E. Becquérel, 384.
rays absorbed, 355.

spectra, after absorption by ura-
nium glass, 314.

spectra, after absorption by qui-
nine, 319.

spectra, after absorption by red
glasses, 322.

spectra, after absorption by green
glasses, 325.

spectra, after absorption by blue
glasses, 328.

spectrum, Berard's idea of, 21.

dark lines of, 49.

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Coloured glasses, prismatic analysis of, 211.
used for analysis of solar
rays, 303.

Colouring matter of leaves, action of, on
light, 44.

property of cobalt, 184.
Colours impressed by solar radiations, 337.
Compound colours, theory of, 42.

Comte Auguste, on the theories of light,

345.

Constitution of the spectrum, by E. Bec-
quérel, 351.

Contact, effects of, 249.

Continuing rays of Becquérel, 113.
Copper, action of, on silver salts, 133.

sulphate of, used in chromatype,

177.

rendered sensitive by iron, 175.
chromate of, 178.

iodide of, 178.

sulphate of, and bichromate of pot-
ash, 290.

glasses, green, absorptive powers

of, 324.

Corchorus Japonica, action of light on, 194.
Corrosive sublimate, curious action of, 112.
Cyanogen compounds, 131.

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INDEX.

Daguerre, first notice of his experiments, 24.
and Niepce become partners, 33.
improves heliography, 189.

on the production of colour, 338.

Daguerreotype, the, 103.

discovery of, announced, 34.
on paper, 111.

Dark lines of spectrum, 48.
Daubeny's experiments on plants, 216.
Davy, Dr., change of corrosive sublimate
noticed by, 18.

Sir Humphry, suggests experiments
on Canton's phos-
phorus, 19.

on Wedgwood's ex-
periments, 21.
observes change in
oxide of lead, 181.

Day, photographic effect at different hours
of the, 357.

Decandolle on the growth of plants, 232.
Delaroche on radiant heat, 347.
Desmortiers on the decolouration of Prus-
sian blue, 16.

Dessaignes, M., on solar phosphori, 271.
Diamagnetic body explained, 301.
Diathermic bodies explained, 56.
Dispersion of light by solution of quinine, 44.
false, 311.

Dizé, crystallization of salts by light, 9.
Dormant image developed in heliography,

31.

Draper, Dr., on the Daguerréotype image,

114.

on Möser's experiments, 253.
on chemical combination of
chlorine and hydrogen, 277.
on variations in actinic power,
363.

Electrical images, 265.

influences of sunshine, 291.
Electric sparks, phosphorogenic rays of, 47.
Electro magnetic force, influence of, on
light, 302.

Englefield, Sir Henry, on the heat rays
the spectrum, 19.

on thermic spectrum, 51.
Engravings copied by thermography, 256.
Epipolized light, 44.

of

Etherial solutions of gold decomposed, 13.
Ethyl, iodide of, 141.280.
Exciting rays of Becquérel, 113.
Experiments to determine the change pro-
duced by solar rays, 75.

Faraday, on the volatilization of mercury, 106.
action of magnets on light,

299.

Fat becomes yellow and rancid when ex-
posed to light, 17.

Ferrocyanide of potassium combined with
iodide of silver, 91.
Ferrocyanides, 186.
Ferrotype, the, 135.

Fischer, M., action of light on salts of gold
observed by, 19.

on ferrocyanides precipitated by
alcohol, 187.

Fishes, the depth to which they live in the
ocean, 353. and Appendix.

Fixing processes of Mr. Talbot, 68.

of Sir John Herschel, 34.
69.

Daguerréotype image, 108.

Fizeau, M., on fixing Daguerréotype image,

109.

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Glass for Palm-House at Kew, 375.
Glasses, coloured, used for analysis of solar
rays, 303.

blue, absorptive powers of, 327.
Goddard, Mr., improves the Daguerréotype,
104.

polariscope employed in experi-
ments on actinism, 336.
Gold solution, as a fixing agent, 109.
photographic properties of, 146.
protocyanide of, 150.

percyanide of potassium and, 151.
plates rendered sensitive, 152.
and copper glasses, red, 321.
percyanide of, Appendix, 371.

Green, vegetable matter, Priestley's experi-

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