556 



INDEX. 



Cephalaspis, observations on the 

 genus, 319. 



Chapman (Prof. E. J.) on the assaj'- 

 ing of coals by the blowpipe, 4."3il 



Chei-.iical notices from foreign joiu-- 

 nals, 109, 299, 453. 



Chlorine, on the sepai-ation of, 144 ; 

 on the action of the electric current 

 on aqueous solutions of, 328. 



Chromium, on the preparation of, 

 112. 



Claudet (A.) on some stereoscopic 

 phaenoniena, 397. 



Clausius (Prof. R.) on the conduction 

 of electricity in electrolytes, 94. 



Clouds, on the forms of, 241. 



Coal-gas, on the influence of musical 

 sounds on the flame of a jet of, 235. 



Coals, on the occurrence of, in South- 

 era Chili, 321 ; on the assaying of, 

 by the blowpipe, 433. 



Cobalt, on the atomic weight of, 115. 



Cockle (J.) on certain researches of 

 Euler, 389. 



Contact-breaker, description of a, 255. 



Cooper (E. J.) on the perihelia and 

 nodes of the planets, 316. 



Copper, on the electric conductivity 

 of commercial, 4/2. 



Coumaric acid, observations on, 299. 



Couper (M.) on bromobenzole and 

 dibromobenzole, 455. 



Crystalline forms, on the relations ex- 

 isting between certain groups of, be- 

 longing to different systems, 157. 



Crystallographic notices, 512. 



Crystals, on the microscopical struc- 

 tui'e of, 152; on an improved me- 

 thod of finding the position of any 

 face in, belonging to the anorthic 

 system, 512. 



Damascus, on the lakes and rivers of, 

 260. 



Daubeny (Dr.) on the evolution of 

 ammonia from volcanos, 233. 



Debus (Dr. H.) on the action of nitric 

 acid on glycerine, 196. 



Dellmann (F.) on atmospheric elec- 

 tricity, 460. 



Despretz (M. C.) on the decomposi- 

 tion of lead-salts by the action of 

 the voltaic current, 78. 



Deville (M.) on the affinity of tita- 

 nium for nitrogen, 109; on some 

 properties of boron, 110; on the 

 preparation of the metals, 113; on 



alloys of silicon, 1 14 ; on a new 

 method of taking vapour-densities, 

 458. 



Diorite, on the constitution of, 518. 



Drajier (Prof. J. W.) ou the nature of 

 flume, and on the conditions of the 

 sun's surface, 90. 



Dynamical problems, on a class of,306. 



Earth's surface, on the diurnal varia- 

 tions of the magnetic force at the, 

 192. 



Eclipse, solar, on the intensity of 

 light during the recent, 305. 



Electric current, on the action of the, 

 on aqueous solutions of chlorine, 

 bromine, and iodine, 328. 



Electrical excitation, on a new source 

 of, 239. 



theory of the thunder-cloud, on 



the, 252. 



Electricity, on the conduction of, in 

 electrolytes, 94 ; on the diflference 

 in the amount of, developed by 

 equal surfaces of cylinder and plate 

 electrical machines, 290 ; on atmo- 

 spheric, 460; on the rotation of 

 metallic tubes and spheres by, 519. 



Electrolytes, on the conduction of 

 electricity in, 94. 



Electro-magnet, on the rotation of 

 the electrical light round the pole 

 of an, 463. 



Epidotes, on the composition of, 159. 



Equations, on the singuliir solutions 

 of differentia), 522. 



Erdmanu (Prof. O. L.) on the for- 

 mation of isatine by ozone, SO. 



Espy (J. P.) on the law of storms, 345. 



Euphotide, on the constitution of,553. 



Euler, on certain researches of, 389. 



Fairbairn (W.) on the strength of 

 alloys of nickel and iron, 486. 



Faroelite, on the crystallme form of, 

 28. 



Favre (P. A.) on the mechanical equi- 

 valent of heat, 406. 



Field (F.) on the separation of iodine, 

 bromine, and chlorine, 144. 



Flame, on the nature of, and on the 

 condition of the sun's surface, 90. 



Flames, sonorous, experiments on, 

 235, 261,404. 



Fluids in motion, on the thermal 

 effects of, 477. 



Fluorescence produced by the aurora, 

 on, 326. 



