Adjustments of a transit instrument, errors in, how computed from observation, 420 - how to proceed in performing, 423.

Anatomy of the mole cricket, 206 et seq.

Angles made by the edges of crystals, general method of determining, 125.

ARAGO. M. repetition of his magnetic experiments, 467.

BARRAGE, C. Esq. F. R. S., his account of the repetition of M. ARAGO's experiments on the magnetism manifested by various substances during rotation, 467.

Bandaging, art of, among the ancient Egyptians, 272.

BARLOW, P. Esq. F. R. S., on the temporary magnetic effect produced in iron by rotation, 117.

BAUER, F. Esq. F. R. S. his microscopical observations and drawings of the nerves in the placenta, Plates II. III. IV. - of the different states of the tadpole in ovo, Plates V. VI. VII. - of the frozen brain, and molecule of the egg, Pl. XXVII.

BESSEL, Prof. his method of determining the quantity of flexure in astronomical instruments, 151.

Brain, Sir E. HOME on the materials of, 436 - microscopic drawings of, Pl. XXVII.

Brine contains little or no air, 336 - its effect in corrosion of immersed metals, 336.

Caoutchouc, the fluid from compressed oil gas an excellent solvent of, 465.

Carbone, Mr. FARADAY's account of new compounds of, and hydrogen, 440.

Carbone, metalloidal, its magnetism, 475

Carbonates, earthy, deposited by sea water on overprotected copper, 330, 336.

CHRISTIE, S. H. Esq. M. A. on the effects of temperature on the intensity of magnetic forces, and on the diurnal variation of terrestrial magnetic intensity, 1.

CHRISTIE, S. H. Esq. M. A., on the magnetism of iron arising from its rotation, 347-417.

CHRISTIE, S. H. Esq. M. A., on the magnetism developed in copper and other substances during rotation, 497.

Collimator, floating. Capt. KATER's description of one, 147 - experiments with various forms of, 156-168 - manner of using, 170 - vertical, description of, 171.

Contingencies, Life, new mode of determining their present value, 513.

Copper sheathing of ships, mechanical wear of in passing through the sea, 332.

Copper sheathing of ships, preservation of by iron and other metals, 328.

Copper sheathing of ships, magnetism of, manifested in rotation, 467, 470, 497, &c.

Cotton, old, how distinguishable from linen, 274.

CROONIAN Lecture, on the existence of nerves in the placenta, 66.

Cricket, mole. See Gryllotalpa.

Crystals, Mr. WHEWELL's general theory of the calculation of their angles, and the laws of decrement of their planes, 87-130.

Crystallography, application of mathematical analysis to the resolution of its principal problems, 89 - general notation for expressing all possible faces and laws of decrement, 90 - correspondence of this notation with HAÜYS, 93 - theory of the rhomboid, tetrahedron, &c. and their derivatives. See Rhomboid, &c.

DAVY, Sir H. Bart. P. R. S., his further researches on the preservation of metals by electro-chemical means, 328.

Deception, optical. Dr. ROGET's explanation of a curious one, 131.

Deriation due to rotation of a magnetic needle, what, 359 - laws of, 379, 381.

Deriation, absolute, 379, 381.

Dihedral angle between two planes of crystals, general formula for finding, 94 - applied to the rhomboid and its derivatives, 95.

Do . Rhombic, in crystallography, theory of its modifications, 120.

Egg, frozen and thawed. Representation of the molecule of, Plate XXVII.

Elk, fossil, of Ireland, Mr. WEAVER on the, 429.

Embalming, art of, among the Egyptians, 269 - ingredients used in, 306 - mode of performing, 309.

Equilibrium of a magnetic needle under the joint influence of the earth and a magnet, general equations of, 6.

Expansion of the lateral braces of a transit, remarkable effect of, 427

Faces, secondary, in crystallography, theory of their arrangement, 121.

FARADAY, M. Esq. F. R. S., on new compounds of carbon and hydrogen, and on the products of the decomposition of oil by heat, 440-466.

Formula, general, for the dihedral angle between any two planes whose equations are given, 94.

Formula, for the plane angle between any two straight lines whose equations are given, 125.

Ganglions, their supposed influence in producing animal heat, 257 - of the skate and electrical eel, 266.

GAUSS, Prof. his method of measuring the angular distance of the wires in a transit, 154.

GOMPERTZ, Benj. Esq. F. R. S., on the law of human mortality, and on life contingencies, 513.

GRANVILLE, A. B.; M. D. F. R. S., on Egyptian mummies, and on the art of embalming among the ancients, 269.316.

Gryllotalpa, or mole cricket, Dr. KIDD on its anatomy, 203-RÖSEL's account of the insect, and its habits, 204 - its external characters, 207 - digestive organs, 222 - blood, 229 - organs of respiration, 231 - muscles, 237 - nerves, 238 - female sexual organs, 240 - male, 241 - mode of casting its skin, 243 - organ of sound, 244 - dimensions, 245.

HAWKINS, C. Esq. his account of the distribution of the nerves connected with the organs of generation, 70 - of ganglia in fishes, 267.

Heat, animal, supposed influence of nerves and ganglia in producing, 257 - of the human uterus, 262 - its increase and diminution not dependent on the action of the arteries, 264.

Heat, radiant, from terrestrial sources, Mr. POWELL's experiments on, 189 et seq. - distinguished into two portions, having different characters, 200.

HERSCHEL, J. F. W. Esq. F. R. S., account of the repetition of. M. ARAGO's experiments on magnetism, 467.

HOME, Sir E. Bart. V. P. R. S. on the existence of nerves in the placenta, 56.

HOME, Sir E. Bart. on the influence of nerves and ganglia in producing animal heat, 257-268.

HOME, Sir E. Bart. on microscopical observations on the materials of the brain and ova, and the analogy between them, 436.

HOME, Sir E. Bart. on the changes in the ovum of the frog during the formation of the tadpole, 81.

Horns of deer supplied with nerves, 67 - their temperature, 259 - of fossil elk found in peat mosses in Ireland and the Isle of Man. See Elk.

Hydrogen and carbon, new compounds of, described, 140. See Carbon - bicarburet of, 443 - new carburet of, having the same proportion of its elements as olefiant gas, 452.

Iguanodon, Mr. MANTELL's account of its fossil remains, 179 - Baron CUVIER's observations on its teeth, 181.

Imagination of mother, its influence on the child instanced, 75, 76, 77, 78.

Intensity of magnetism in a magnet increased by cold, 62 - diminishes rapidly by an increase of temperature from 80° F. upwards, 63 - partially destroyed by a temperature above 100°F. 63 - insoft iron increases with an increase of temperature. 63.

Iron, its effects in protecting copper from action of sea water, 328-346 - magnetic phaenomena depending on its rotation, 117.347

Iron, soft, its effect in intercepting rotato-magnetism, 470.

JOHNSON, J. R., M. D. F. R. S., his further observations on planariae, 247-255.

KATER, Capt. H., F. R. S., his description of floating collimator, 147-178.

KIDD, J., M. D. F. R. S., on the anatomy of the mole cricket,

Life contingencies. M. GOMPERTZ on a new mode of determining their value, 513.

Light, artificial, measured by Dr. RITCHIE's photometer, 144.

Magnetic effect, temporary, induced in iron by rotation, 117 - cause of, 323 - law of. 325.

Magnetic effect, permanent, arising from rotation, 347 - general description of its phaenomena, 354 - experiments to obtain measures of, 358 - mathematical theory of, 393 - compared with experiment, 399 - degree of its permanence, 405 - comparative effects of slow and rapid rotation, 413.

Magnetic needle, general equations for the equilibrium of, 6.

Magnetic effect susceptibilities, means of magnifying small ones, 482 - distinguished from retentive powers,

Magnetism, earth's, of the induced kind, 326 - perhaps induced by the sun, 411 - how it may be conveniently neutralized in magnetic experiments, 476.

Magnetism, effects of temperature on its intensity, 1. See Intensity - of soft iron increased by increase of temperature, 63 - of a magnet diminished, 63.

Magnetism, of various substances manifested during rotation, Messrs. BABRAGE and HERSCHEL on, 467-496 - means of measuring its intensity, 472-475 - effect of solution of continuity in metals, 481 - of solders in re-establishing it, 482 - attempt to explain these phaenomena, 486.

Magnetism. Mr. CHRISTIE on the same subject, 497 - experiments with various combinations of copper discs and magnets, 497-499 - to determine the variation of rotatory force with the distance, 502.507 - with the weights of the discs used, 508, 9.

Man, Isle of, remains of the Irish elk discovered in, 435.

Marl, incumbent on peat, remains of the fossil elk occurring in, 431 - List of fossil shells in, 431.

Meridian mark, the telescope of a collimator used for that purpose, 178 - first applied by Mr. RITTENHOUSE 431

MANTELL, G. Esq. F. L. S. M. G. S., his notice on the Iguanodon, 179-186.

Metals, their preservation by electro-chemical means, 328 - magnetic effects manifested by the different, during rotation, 473, &c.

Mole cricket. See Gryllotalpa.

Mortality, human, Mr. GOMPERTZ on the law of, 513.

Mummy. Dr. GRANVILLE's account and dissection of a female one, 269 - dimension of, 278 - dimensions a male one, 290 - perfect preservation of its muscles and other parts, 296.

Needle, dipping, experiments with, 383

Nerves, their existence in the placenta proved, 66 - their influence in producing animal heat, 257.

Observatory at Cambridge, account of the transit at, 418.

Octahedron in crystallography, theory of its modifications, 106.

Oil, products obtainedfrom, during its decomposition by heat, 440 - by compression of oil gas, 441.

Oil gas, analysis of by sulphuric acid, 462.

Optical deception, Dr ROGET's explanation of a curious one, 131.

Ora, materials of, compared with those of the brain, 436.

Ovum of the frog, its changes during the formation of the tadpole, 81.

Peat bogs, remains of the Irish elk found in, 431.

Photometer, Dr. RITCHIE's account of a new one, 141.

Placenta, the existence of nerves in, proved, 60.

Planariae, Dr. JOHNSON's observations on, 247 - obtain additional heads by incision, 247 - Mr. DALYELL's account of, 247, 8.

POND, J. Esq Astr. Royal, on the annual variations of some of the principal fixed stars, 510.

POWELL. the Revd. B., M. A. F. R. S., his experimental enquiry into the nature of radiant heat from terrestrial sources, 187.

Preservation of metals by electro-chemical means, 328.

Prism, quadrangular, in crystallography, theory of its modifications, 102.

Prism, regular triangular, 119.

Protecting effects of zinc, &c. on copper, how modified by imperfect communication, 334, 337.

Quadratrices, a class of curves expressing the apparent form of the spokes of a revolving wheel, seen through vertical apertures, 138 - their general equation, 139.

Radiant heat, terrestrial, Mr. POWELL on, 187.

Reptile, fossil, a new species of described, 179.

Retina, its retention of impressions applied to explain an optical deception, 135.

Rhomboid, in crystallography, theory of its modifications, 89.

RICTCHIE, Revd. W., on a new photometer, with its application, &c. 141. 146.

ROGET; P. M., M. D. F. R. S., his explanation of an optical deception in the appearance of the spokes of a revolving wheel, &c. 131. 140.

Rotation, its effect in developing magnetic effects. See Magnetism.

Sandstone of Tilgate forest, fossil remains of the Iguanodon found in, 179.

Screens of glass, their effect in intercepting terrestrial heat, 187.

Secondary faces of crystals, theory of their arrangement, 121.

Shells, fossil, in peat marl in Ireland, list of, 432.

Ships, protection of their copper by iron, 340 - instanced in the cases of the Sammarang, Elizabeth, Carnebrea Castle, Howe, and others, 342, 3.

Solutions, alkaline, their effect in altering or subverting the electro-chemical relation between protected and protecting metals,

Stars, fixed, Mr. POND on their annual variations, 510.

Tables, Mr. GOMPERTZ's, for computing life contingencies, 547.

Tadpole, progress of its formation in ovo, 81, Plate XXVII.

Temperature, its influence on the intensity of magnetic forces, Mr. CHRISTIE on, 1.

Terrestrial magnetic intensity, its diurnal variation, Mr. CHRISTIE, on 1.

Tetrahedron, in crystallography, theory of its modifications, 106.

Tilgate forest. See Sandstone.

Tracheae of insects, their structure, 234 - of the mole cricket, 234 - their supposed office, 235.

Transit instrument of the Cambridge Observatory, account of, 418 - remarkable effect arising from the expansion of its braces, 427 - counterpoises of a source of unsteadiness, 427.

Uterus, high temperature of during labour, 263.

Variation, diurnal, of terrestrial magnetic intensity, 1 - HANSTEEN's results respecting, 60.

Variation of the principal fixed stars, 510.

Vertebrae of crocodiles and recent lacertae, how distinguished from those of Saurian reptiles, 185.

Weeds, their adhesion to copper bottoms of ships, how produced, 329.

WHEWELL, W., M. A., F. R. S. on the calculation of the angles of crystals, and their laws of decrement, 87. 130.

WOODHOUSE, Revd. R., M. A. F. R. S., his account of the transit instrument at Cambridge, 418.