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INDEX TO THE PHILOSOPHICAL TRANSACTIONS FOR THE YEAR 1848. A. Andrews (Thomas, M.D.). On the Heat disengaged during Metallic Substitutions, 91. B. Bakerian Lecture, 1. Baxter (H. F., Esq.). An experimental inquiry undertaken with the view of ascertaining whether any, and what signs of current Electricity are manifested during the organic process of Secretion in living animals, being an attempt to apply some of the discoveries of Faraday to Physiology, 243. Beechey (Captain F. W., R.N.). Report of Observations made upon the Tides of the Irish Sea, and upon the great similarity of Tidal phenomena of the Irish and English Channels, and the importance of extending the experiments round the Land's End and up the English Channel, 105. Belemnites, observations on some, and other Fossil Remains of Cephalopoda, discovered by Mr. R. N. Mantell, C.E., in the Oxford Clay near Trowbridge, in Wiltshire, 171. Belemnoteuthis, Phragmocone of the, 174. Brodie (Benjamin Collins, Esq.). An investigation on the Chemical Nature of Wax. I. On Cerotic Acid, a new acid contained in Bees'-wax, 147. II. On the Chemical Nature of a Wax from China, 159. C. Carbonic acid, action of light on the decomposition of, 272. Ceroten, 167. Cerotic Acid, 147, 149; distillation of, 154; from the saponification of wax, 164. Ether, 152. Cerotin, 160; distillation of, 166. Chitons, on the structure of, 141. Cotidal Lines, 2. D. Differential Equations, on the Solution of Linear, 31. I. General Theorems of the Calculus of Operations, ibid. II. Application of these Theorems to the solution of Equations, 33. III. Solution of equations by interchange of symbols alone, 38. IV. Application to Partial Differential Equations, 42. V. Connection with Definite Integrals, 44. VI. Linear Equations in Finite Differences, 48. VII. Miscellaneous forms, 52. Diurnal Inequality, 22. From observations, 25. E. Electricity, current, an experimental inquiry undertaken with the view of ascertaining whether any, and what signs of, are manifested during the organic process of Secretion in living animals, being an attempt to apply some of the discoveries of Faraday to Physiology, 243. Erythric Ether, 73. Methylic ether, 74. Picro-erythrin, 75. Evernia Prunastri, 79. Evernic acid, 80. Evernesic acid, 81. Evernesic ether, 84. Exhalation (of Plants), action of light on, 270. G. Glaisher (James, Esq.). On the corrections to be applied to the Monthly Means of Meteorological Observations taken at any hour, to convert them into Mean Monthly values, 125. Gray (J. E., Esq.). On the structure of Chitons, 141. H. Hargreave (Charles James, Esq.). On the Solution of Linear Differential Equations, 31. Heat, on the, disengaged during Metallic Substitutions, 91. Salts of Copper with Zinc, 92. Salts of Copper with Iron, 96. Salts of Copper with Lead, 97. Salts of Silver with Zinc, 98. Salts of Silver with Copper, 100. Salts of Mercury with Zinc, 101. Salts of Platinum with Zinc, 102. Hepatic Ducts, Microscopical examination of the contents of the, with conclusions founded thereon as to the Physiological Signification of the cells of hepatic parenchyma, and as to their anatomical relation to the radicles of the hepatic ducts, 277. I. Iguanodon, on the Structure of the Jaws and Teeth of the, 183. J. Jones (Henry Bence, M.D.). On a new substance occurring in the Urine of a patient with Molitites Ossium, 55. Jones (T. Wharton, Esq.). Microscopical examination of the contents of the Hepatic Ducts, with conclusions founded thereon as to the physiological signification of the cells of Hepatic Parenchyma, and as to their anatomical relation to the radicals of the Hepatic Ducts, 277. K. Keely (Professor George W.). Determinations of the Magnetic Inclination and Force in the British Provinces of Nova Scotia and New Brunswick in the Summer of 1847, 203. L. Leaves (of Plants), on the direction of, 264. Lichens, on the proximate principles of some of the, 63. South American variety of Roccella tinctoria, 64. Cape of Good Hope variety, 69. Roccella Montagnei, 72. Evernia Prunastri, 79. Light, on the inclination of the stems of plants towards, 257. Action of, on exhalation, 270. Action of, on the decomposition of carbonic acid, 272. Light, on a new Case of the Interference of, 213. M. Macaire (Professor). On the Direction assumed by Plants, 253. Magnetic Inclination and Force, determinations of the, in the British Provinces of Nova Scotia and New Brunswick in the Summer of 1847, 203. Mantell (Gideon Algernon, Esq.). Observations on some Belemnites and other Fossil Remains of Cephalopoda, discovered by Mr. R. N. Mantell, C.E., in the Oxford Clay near Trowbridge, in Wiltshire, 171. On the Structure of the Jaws and Teeth of the Iguanodon, 183. Meteorological Observations, on the corrections to be applied to the Monthly Means of, taken at any hour, to convert them into Mean Monthly values, 125. O. Orcin, on, and its preparation, 85. Pseudo-, 76. Orsellie Acid, 64, 69. Orsellisic acid, 66. Orsellisic ether, 68. P. Pacific, on the Tides of the, 1. Materials for a Tide-Map of the, 10. Plants, on the direction assumed by, 253. § 1. On the curling-up of Tendrils, ibid. § 2. On the inclination of Stems towards light, 257. § 3. On the direction of Leaves, 264. § 4 Action of Light on Exhalation, 270. § 5. Action of Light on the decomposition of carbonic acid, 272. Powell (The Rev. Baden). On a new Case of the Interference of Light, 213. Porpoise, on the Blow-hole of the, 117. MDCCXLVIII. R. *Roccella tinctoria*, from South America, 64; from the Cape of Good Hope, 69. — Montagnei, 72. *Roccellinin*, 71. S. *Sibson* (Francis, Esq.). On the Blow-hole of the Porpoise, 117. *Spectrum*, on the Theory of certain Bands seen in the, 227. *Stems* (of Plants), on the inclination of, towards the light, 257. *Stenhouse* (John, Esq.). Examination of the proximate principles of some of the Lichens, 63. *Stokes* (G. G., Esq.). On the Theory of certain Bands seen in the Spectrum, 227. T. *Tendrils* (of Plants), on the curling-up of, 253. *Tides* of the West Coast of America (South), 14. West Coast of America (North), 15. Isles of the Pacific (South), 17. (North), *ibid.* Central Pacific, 18. Australia, 19. *Tides of the Irish Sea*, Report of Observations made upon the, and upon the great similarity of Tidal phenomena of the Irish and English Channels, and the importance of extending the experiments round the Land's End and up the English Channel, 105. *Tides, Researches on the.—Thirteenth Series*. On the Tides of the Pacific, and on the Diurnal Inequality, 1. U. *Urine*, on a new substance occurring in the, 55. Analysis of this substance, 59. *Usnic Acid*, 88. W. *Wax*, an investigation on the chemical nature of. I. On Cerotic Acid, a new acid contained in Bees'-wax, 147. Cerotic Acid, 149. Cerotic Ether, 152. Chlor-cerotic Acid, 153. Chlor-cerotic Ether, 154. Distillation of Cerotic Acid, *ibid*. II. On the chemical nature of a Wax from China, 159. Cerotin, 160. Sulphate of the oxide of Cerotyle, 162. Chlor-cerotic Aldehyde—Chlor-cerotol, 163. Cerotic Acid from the saponification of the wax, 164. Distillation of Cerotin, 166. Distillation of Chinese Wax, *ibid*. Ceroten, 167. Chlor-ceroten, 168. *Whewell* (The Rev. William, D.D.). Researches on the Tides. Thirteenth Series, 1. 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 1847 to June 1848. PRESENTS. DONORS. ACADEMIES and SOCIETIES. Amsterdam:—Nieuwe Verhandelingen der Eerste Klasse van het Koninklijk-Nederlandsche Instituut van Wetenschappen Letterkunde en Schoone Kunsten te Amsterdam. Dertiende Deel. 4to. Amsterdam 1848. The Society. Berlin:— Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin, 1845. 4to. Berlin 1847. The Academy. Monatsbericht der Königl. Preuss. Akademie der Wissenschaften zu Berlin, January to December 1847. 8vo. The Society. Berne:—Mittheilungen der Naturforschenden Gesellschaft in Bern. Nos. 39 to 58. 8vo. Bern 1845. The Society. Bologna:—Novi Commentarii Academiae Scientiarum Institutii Bononiensis. Tomus octavus. 4to. Bononia 1846. The Academy. Boston (United States):— Proceedings of the American Academy of Arts and Sciences. Nos. 7 to 37. 1847. 8vo. Boston. The Academy. Proceedings of the Boston Society of Natural History. Nos. 10 to 16. 1845–46. 8vo. Boston 1845. The Society. The Boston Journal of Natural History. Nos. 2 and 3. Vol. V. 8vo. Breslau:— Novorum Actorum Academiae Caesareae Leopoldino-Carolinae Naturae Curiosorum, Abt. 2. Band 21. 4to. Breslau 1845. The Academy. Uebersicht der Arbeiten und Veränderungen der Schlesischen Gesellschaft für vaterländische Kultur im Jahre 1846. 4to. Breslau 1847. The Society. Brussels:— Mémoires de l'Académie Royale des Sciences de Belgique. Tome 20. 4to. Bruxelles 1847. The Academy. Nouveaux Mémoires de l'Académie Royale des Sciences de Bruxelles. Tome 19. 4to. Bruxelles 1845. Mémoires Couronnés et Mémoires des Savants Étrangers, publiés par l'Académie Royale de Belgique. Tomes 19, 20, 21. 4to. Bruxelles 1845–46. MDCCCXLVIII. PRESENTS. ACADEMIES and SOCIETIES (continued). Brussels:— Bulletin de l'Académie Royale des Sciences de Belgique. Nos. 6 to 12, Tome 13, and Nos. 1 to 6, Tome 14. 8vo. Bruxelles 1846–47. Annuaire de l'Académie Royale de Belgique pour 1846–47. 8vo. Bruxelles, 1846–47. 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