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INDEX TO THE PHILOSOPHICAL TRANSACTIONS FOR THE YEAR 1855. A. AIRY (G. B.). On the computation of the Effect of the Attraction of Mountain-masses, as disturbing the Apparent Astronomical Latitude of Stations in Geodetic Surveys, 101. Attraction of mountain-masses, effect of, in geodetic surveys, 53, 101 (see PRATT, AIRY). B. BAKERIAN LECTURE, On the Nature of the Force by which Bodies are repelled from the Poles of a Magnet, &c., 1. BARLOW (W. F.). Observations on the Respiratory Movements of Insects, 139.—Natural respiratory movements of the Dragon-fly, 139; influence of decapitation, 140; influence of shock, 142; respiration in the separate segments of the insect, 143; conclusions, 147. BARLOW (W. H.). On the existence of an element of Strength in Beams subjected to Transverse Strain, arising from the Lateral Action of the fibres or particles on each other, and named by the author the 'Resistance of Flexure,' 225.—Determination of the neutral axis, 225; effect of lateral action considered, 228; resistance to flexure and increase of strength thence resulting, 230; experiments, 231, &c. Beams, on an element of strength in, 225 (see BARLOW). BINNEY (E. W.) and J. D. HOOKER. On the Structure of certain Limestone Nodules enclosed in seams of Bituminous Coal, with a Description of some Trigonocarpons contained in them, 149. C. Cairo, recent researches near, 105 (see HORNER). Cheletropis Huxleyi, anatomy of, 289, 295 (see MACDONALD). Chemical affinity, on circumstances modifying the action of, 179 (see GLADSTONE). Chlororubian, 407. Coloured salts, experiments with, bearing on chemical affinity, 179 (see GLADSTONE). D. Definite integrals, on the theory of, 157. Diamagnetic force, on the, 1 (see Tyndall). Differential equations, on a class of, 299 (see Donkin). Donkin (W. F.). On a Class of Differential Equations, including those which occur in Dynamical Problems. Part II., 299.—On the variation of elements, 304; transformation of variables—definition of normal transformations, 213; transformation of coordinates, 317; transformation from fixed to moving axes, 322; differential equations of the planetary theory, 330; application to the problem of Three Bodies, 337; appendices, 349. Dragon-fly, experiments on the respiration of the, 139 (see Barlow). Dynamical problems, on the differential equations which occur in, 299 (see Donkin). E. Egypt, excavations in, 105 (see Horner). F. Frankland (E.). Researches on Organo-metallic Bodies. Second memoir, Zincethyle, 259.—Action of oxygen upon zincethyle, 267; of iodine, 271; of bromine, 273; of chlorine, 273; of sulphur, 273; of water, 274. G. Gasteropoda, 289, 295 (see Macdonald). Geodetic surveys, disturbance of the apparent astronomical latitude in, by mountain attraction, 53, 101 (see Pratt, Airy). Gladstone (J. H.). On Circumstances modifying the Action of Chemical Affinity, 179.—Ferric sulphocyanide, 182; dependence of the amount of the coloured salt on other substances in the solution, 183, 192; the colour not dependent on the original arrangement of the constituents, 185; influence of mass of one of the substances that produce the salt, 186; other ferric salts, 192; gold, &c. salts, 204; organic substances, 209; general inferences, 212; testimony from other chemical phenomena, 214. H. Himalaya mountains, attraction of the, 53 (see Pratt). Hooker (J. D.) and E. W. Binney. On the Structure of certain Limestone Nodules enclosed in seams of Bituminous Coal, with a Description of some Trigonocarpons contained in them, 149. Horner (L.). An Account of some recent Researches near Cairo, undertaken with the view of throwing light upon the Geological History of the Alluvial Land of Egypt, 105.—Physical Geography and Geological Structure of Egypt, 109; inundations of the Nile, 114; solid matter conveyed by the Nile, 117; the recent researches, 119; excavations at Heliopolis, 123; description and analyses of the soils, 124; descriptions of the several pits sunk, 131; synopsis of the soils sunk through, 137. L. *Limestone nodules*, on the structure of certain, 149. M. Macdonald (J. D.). On the Anatomy of *Nautilus umbilicatus*, compared with that of *Nautilus Pompilius*, 277. Remarks on the Anatomy of *Macgillivrayia pelagica* and *Cheletropis Huxleyi* (Forbes); suggesting the establishment of a new Order of Gasteropoda, 289. Further observations on the Anatomy of *Macgillivrayia*, *Cheletropis*, and allied genera of pelagic Gasteropoda, 295. *Macgillivrayia pelagica*, anatomy of, 289, 295. *Madder*, 389 (see Schunck). *Magnet*, on the nature of the force by which bodies are repelled from the poles of a, 1 (see Tyndall). *Megatherium*, Professor Owen on the, 359. *Muscular fibre*, on the development of striated, in Mammalia, 243. N. *Nautilus umbilicatus*, anatomy of, compared with that of *Nautilus Pompilius*, 277. *Nile*, deposit of the (see Horner). O. *Organo-metallic bodies*, researches on, 257 (see Frankland). Owen (R.). On the Megatherium (*Megatherium Americanum*, Cuvier and Blumenbach). Part II. Vertebrae of the trunk, 359.—Of the spinal column, 368; comparison of the vertebral column, 381. P. *Planetary theory*, differential equations of the, 330. *Polarity*, diamagnetic, 33 (see Tyndall). Pratt (Archdeacon J. H.). On the Attraction of the Himalaya Mountains, and of the elevated Regions beyond them, upon the Plumb-line in India, 53.—Dissection of the attracting mass, 64; approximation to the amount of attraction, 71; numerical results, 85; excess of calculated results accounted for, 95. R. *Resistance of flexure in beams*, 225 (see Barlow). *Respiratory movements of insects*, on the, 139 (see Barlow). *Rubian, rubianic acid*, &c., 389 (see Schunck). Russell (W. H. L.). On the Theory of Definite Integrals, 157. S. Savory (W. S.). On the Development of Striated Muscular Fibre in Mammalia, 243. Schunck (E.). On Rubian and its Products of Decomposition, Part III.—Combined action of alkalies and oxygen on rubian, 389.—Rubianic acid, 393; rubidehydran, 401; rubihydran, 404; action of chlorine on rubian, chlororubian, 407; action of acids on chlororubian, 409; of caustic alkalies, 414; of chlorine, perchlororubian, 417. T. Trigonocarpon, affinities of, 149. Tyndall (J.). On the Nature of the Force by which Bodies are repelled from the Poles of a Magnet; to which is prefixed, an Account of some Experiments on Molecular Influences, 1. —On the magnetic properties of wood, 6; on the rotation of bodies between pointed magnetic poles, 8; on the distribution of the magnetic force between two flat poles, 13; state of diamagnetic bodies under magnetic influence, repulsions proportional to the squares of the magnetic force, 14; duality of diamagnetic excitement, 23; separate and joint action of a magnet and a voltaic current, 24; diamagnetic polarity, 33; on M. Weber's theory of diamagnetic polarity, and on M. Ampère's theory of molecular currents, 38; note on M. Matteucci's objections, 41; crucial experiment, 44. Z. Zincethyle, 259 (see Frankland). PRESENTS RECEIVED BY THE ROYAL SOCIETY, WITH THE NAMES OF THE DONORS. From November 1854 to June 1855. PRESENTS. DONORS. ACADEMIES and SOCIETIES. 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