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INDEX TO THE PHILOSOPHICAL TRANSACTIONS FOR THE YEAR 1842. A. Actinometer, Herschel's, 231. Comparison of actinometers used in observations at Brienz and at the Faulhorn, 243. Observations at Brienz, September 25, 1832, 248. At the Faulhorn, 249. Miscellaneous observations in September 1832, 266. Observations on the Lower Aar glacier, 269. On the absolute values of the degrees of the actinometers employed, 272. Addison (William, Esq.). On the ultimate distribution of the air-passages, and the formation of the air-cells of the lungs, 157. Airy (George Biddell, Esq.). On the laws of the rise and fall of the tide in the river Thames, 1. Atmosphere, on the transparency of the, and the law of extinction of the solar rays in passing through it, 225. § I. Qualities of rays, ibid. § II. History of the inquiry, 226. § III. On the mass of atmospheric air traversed by rays with varying obliquities, 233. § IV. Account of the observations, 241. Comparison of actinometers, 243. § V. Analysis of the observations of the 25th of September, 1832, 251. § VI. Concerning the law of extinction, 257. § VII. Other observations in 1832, 265. § VIII. Observations in 1841, 268. § IX. Conclusions, 271. Additional notes, 272. Aurora Borealis, report of a remarkable appearance of the, below the clouds, 87. B. Bakerian Lecture, 225. Barry (Martin, M.D.). On fibre, 89. Blood, facts observed in the coagulation of the, 110. Blood-vessels, facts observed in the structure of, 104. Bowerbank (J. S., Esq.). On the organic tissues in the bony structure of the Corallidae, 215. Bowman (William, Esq.). On the structure and use of the Malpighian bodies of the kidney, with observations on the circulation through that gland, 57. C. Cheiranthus cheiri (Wall-flower). Photographic action on a solution of, spread on paper, 196. Chrysotype, a new photographic process, 206, 209. Colours of flowers, of the, in general under the action of the spectrum, 186. Of particular flowers, 190. Colours, vegetable, on the action of the rays of the solar spectrum on, 181, 186, 190. Cases of negative photographic action on, 196. Corallidae, on the organic tissues in the bony structure of the, 215. Corchorus Japonica, action of the solar rays on a solution of the flowers, spread on paper, 190. Crystalline lens, facts observed in the formation and structure of the, 103. D. Daniell (J. Frederic, Esq.). Sixth letter on voltaic combinations, 137. E. Electric inductive capacity, on the specific, of certain substances, 165. F. Farquharson (The Rev. James, LL.D.). Report of a remarkable appearance of the aurora borealis below the clouds, 87. Fibre, on, 89. Formation of a flat filament within the blood-corpuscle, *ibid.* Structure of the flat filament ("fibre") more particularly investigated, 92. The spiral form as general in animals as in plants—universality and early appearance of the spiral form, 93. Mode of origin of the flat filament ("fibre")—its reproduction, *ibid.* Facts observed in the formation and structure of nerve, 95. Facts observed in the formation and structure of muscle, 98. Facts observed in the formation and structure of the crystalline lens, 103. Facts observed in the structure of blood-vessels, mould, woody fibre, hair, feathers, &c., 104. On the structure and mode of increase of the vegetable spiral.—On the reticulated duct, annular duct, and dotted duct of plants, 107. Analogy between the tissues of animals and plants, after (as well as before) their formation is complete, 109. Additional observations, 110. Facts observed in the coagulation of the blood, *ibid.* Forbes (James D., Esq.). On the transparency of the atmosphere and the law of extinction of the solar rays in passing through it, 225. G. Geology, physical, researches in, Third Series. On the thickness and constitution of the earth's crust, 43. Ellipticity of any surface of equal density within the earth, 49. Thickness of the earth's crust, 50. Constitution of the earth's crust, 51. Permanence in the inclination of the earth's axis, 53. Condition respecting the temperature of fusion for the matter composing the earth, in order that its actual temperature may be due to its original heat, 54. Guaiacum, action of the rays of the solar spectrum on a solution of this resin, spread on paper, 182. H. Harris (W. Snow, Esq.). On the specific inductive capacities of certain electrical substances, 165. Herschel (Sir John F. W., Bart., K.H.). On the action of the rays of the solar spectrum on vegetable colours, and on some new photographic processes, 181. Postscript, 209. Hopkins (William, Esq.). Researches in physical geology. Third Series, 43. K. Kane (Robert, M.D.). Contributions to the chemical history of palladium and platinum, 275. Kidney, Malpighian bodies of the, on the structure and use of the, with observations on the circulation through that gland, 57. L. Lee (Robert, M.D.). An appendix to a paper on the nervous ganglia of the uterus, with a further account of the nervous structures of that organ, 173. Lungs, on the ultimate distribution of the air-passages, and the formation of the air-cells of the, 157. M. Magnetic Intensity, track of the minimum, in the Atlantic, 32. Magnetism, Terrestrial, contributions to. No. III., 9. § 5. Observations between England and the Cape of Good Hope, 9. § 6. Observations between the Cape of Good Hope and Kerguelen Island, 36. Malpighian bodies of the Kidney, on the structure and use of the, with observations on the circulation through that gland, 57. By the arteries, the Malpighian tufts can be injected with great facility, and also, with less freedom, the capillaries surrounding the uriniferous tubes.—The tubes also may be injected by extravasation from the Malpighian tufts, 66. By the veins, the capillaries surrounding the tubes may be injected, but neither the Malpighian bodies, nor the arteries, nor, without extravasation, the tubes, 68. By the tubes, the Malpighian bodies cannot be injected, nor, without extravasation, either the plexus surrounding the tubes, or the veins, 69. Mathiola annua (Common ten-weeks' Stock), action of the solar rays on a solution of the flowers, spread on paper, 191. Mercury, photographic properties of, 213. Muscle, facts observed in the formation and structure of, 98. N. Nerve, facts observed in the formation and structure of, 95. P. Palladium and Platinum, contributions to the chemical history of, 275. Section I. Palladium compounds, 276. Oxides of palladium, ibid. Chlorides of palladium, 280. Of the oxychloride of palladium, 282. Of the sulphates of palladium, 287. Basic sulphate of palladium, 288. Of the ammonia-sulphates of palladium, 291. Of the nitrates of palladium, 292. Ammonia-nitrates of palladium, 295. Double oxalate of palladium and ammonia, 297. Section II. Platinum compounds, 298. Protoxychloride of platinum, ibid. Action of ammonia on biniodide of platinum, 299. On the action of ammonia on the perchloride of platinum, 300. Papaver Rheum (Red Poppy), action of light on a solution of, 199. Photographic action, cases of negative, on vegetable tints, 196. Photographic processes, on some new, 181, 201, 209. Photographic properties of mercury, 213. Prismatic spectrum, further proofs of the continuation of the visible, beyond the extreme violet, 194. R. Rees (G. Owen, M.D.). On the chemical analysis of the contents of the thoracic duct in the human subject, 81. S. Sabine (Lieut.-Colonel Edward, R.A.). Contributions to terrestrial magnetism, No. III., 9. Senecio splendens, action of light on a solution of, 199. INDEX. Solar spectrum, on the action of the rays of the, on vegetable colours, 181. Sparaxis tricolor, photographic action on a solution of, 199. Spongiadæ, animal nature of the, 223. T. Table, of observations of the magnetic intensity on shore, and on board Her Majesty's Ship Erebus, by Captain James Clark Ross, R.N., between London and the Cape of Good Hope, 14. ——— between the Cape of Good Hope and Kerguelen Island, 38. ——— of observations of the magnetic intensity on shore, and on board Her Majesty's Ship Terror, between London and the Cape of Good Hope, 27. ——— between the Cape of Good Hope and Kerguelen Island, 39. ——— of the intensities observed in Her Majesty's Ship Erebus, in the space of the Atlantic comprised within the isodynamic curve of 0°9, 34. ——— of the intensities observed in Her Majesty's Ships Erebus and Terror between the Cape of Good Hope and Kerguelen Island, 41. ——— of the diameter of Malpighian bodies, and of tubes emerging from them, in fractions of an English inch, 72. ——— of the electric inductive capacities of various bodies, 170. ——— of atmospheric thicknesses corresponding to different elevations, 241. ——— of meteorological observations at Brienz, Sept. 25, 1832, 247. ——— at the Faulhorn, Sept. 25, 1832, 248. ——— of actinometer observations at Brienz, Sept. 25, 1832, ibid. ——— at the Faulhorn, Sept. 25, 1832, 249. ——— of results of actinometer observations at Brienz and the Faulhorn, Sept. 25, 1832, 250. ——— of meteorological observations at various stations, September 1832, 265. ——— of miscellaneous actinometer observations, September 1832, 266. ——— of miscellaneous comparative actinometer observations, September 1832, 267. ——— of actinometer observations on the glacier of the Lower Aar glacier, 269. Thames, on the laws of the rise and fall of the tide in the river, 1. Thoracic duct, on the chemical analysis of the contents of the, in the human subject, 81. Tide, on the laws of the rise and fall of the, in the river Thames, 1. Turmeric, action of light on paper coloured with tincture of, 194. U. Uterus, an appendix to a paper on the nervous ganglia of the, with a further account of the nervous structures of that organ, 173. V. Viola odorata, action of light on a solution of, spread on paper, 198. Voltaic combinations, sixth letter on, 137. LONDON: PRINTED BY RICHARD AND JOHN E. TAYLOR, RED LION COURT, FLEET STREET. PRESENTS RECEIVED BY THE ROYAL SOCIETY, WITH THE NAMES OF THE DONORS. From November 18th 1841 to June 21st 1842. PRESENTS. DONORS. ACADEMIES and SOCIETIES. Berlin: Akademie der Wissenschaften. Abhandlungen für 1839. 4to. Berlin 1841. The Academy. Bericht für Nov. 1841 bis März 1842. 8vo. Berlin. Birmingham:—Philosophical Institution. 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