INDEX. 



463 



Nabel (M.) on blasting-experiments 

 made with nitroglycerine, 236. 



Newton's rule for imaginary roots, 

 on, 113, 232, 289, 363. 



Niobium, on the compounds of, 445. 



Nitroglycerine, on blasting experi- 

 ments made with, 236. 



Nomenclature, chemical observations 

 on, 11, 57. 



Norton (Prof. W. A.) on molecular 

 physics, 95, 276. 



Oxygen, on a new mode of preparing, 

 252. 



Paintings, on the preservation of, 389. 



Pelouze (J.) on chrome aventurine, 

 4*55. 



Perowskite, on the artificial formation 

 of, 251. 



Phenylic acid, on the action of iodine 

 on, 357- 



Photographic figures, on moving, 271. 



image, on the nature of the in- 

 visible, 238. 



Plateau (Prof.) on the conditions of 

 stability of thin films of liquids, 

 343. 



Poggendorff (Prof.) on a new form of 

 mercurial air-pump, 129. 



Price (Dr. D. S.) on the action of 

 light on sulphide of lead, 389. 



Pyromucic acid, researches on, 360. 



Pyrotartaric acid, on the decomposi- 

 tion of, by sunlight, 358. 



Quantoids, on, 347. 



Quartic curve, on a triangle in- and 

 circumscribed to a, 340. 



Radiation, on the emission of lumi- 

 nous, at a red heat, 136. 



Rankine (W. J. M.) on the second 

 law of thermodynamics, 241 ; on 

 thermodynamic and metamorphic 

 functions, disgregation, and real 

 specific heat, 407. 

 Retina, on the visual sensations pro- 

 duced by intermittent excitations 

 of the, 319. 

 Royal Society, proceedings of the, 59, 



144, 314. 

 Rubenson (Dr.) on the cause of atmo- 

 spherical polarization, 180. 

 Rubidium, on the occurrence of, 254. 

 Rudorff (M.) on a method for deter- 

 mining the quantity of carbonic 

 acid in coal-gas, 251. 

 Rutylene, on the preparation and pro- 

 perties of, 356. 



Salts, on the deportment of two, in 

 solution, 382. 



Saturn, on the spectral rays of the 

 planet, 73. 



Schmelz (M.) on pyromucic acid, 

 360. 



Schrotter (Prof.) on indium, 318. 



Schutzenberger (M.) on the action of 

 iodine on phenylic acid, 357 ; on 

 the preparation of methyle, 35.9. 



Schunck (Dr. E.) on some products 

 derived from indigo-blue, 293. 



Secchi (Father) on the spectral rays 

 of the planet Saturn, 73. 



Seekamp (W.) on the decomposition 

 of succinic and pyrotartaric acids 

 by sunlight, 358. 



Selenium, on the extraction of, 445. 



Silver, analyses of some varieties of 

 native, 144. 



Skull, on the vertebral theory of the, 

 374. 



Solar spectrum, on the terrestrial 

 rays of the, 78. 



Solvents, on chemical reactions ob- 

 tained by employing anhydrous 

 liquids as, 414. 



Sound, on the velocity of, 34, 391 ; 

 on the reflexion of, 240. 



Spectra of metallic vapours, on the 

 inversion of the, 390. 



Sphene, on the artificial formation of, 

 251. 



Stahlschmidt (M.) on nitride of iron, 

 249. 



Stars, on a possible method of deter- 

 mining the distance of certain vari- 

 ably coloured, 386. 



Steam, on the law of density of satu- 

 rated, 1. 



Stefan (J.) on some thermo-elements 

 of great electromotive force, 77 • 



Steinheil (K. A.) on a new form of 

 the heliotrope, 458. 



Stewart (B.) on the heating of a disk 

 by rapid rotation in vacuo, 314. 



Strecker (Prof.) on some salts of thal- 

 lium, 256. 



Succinic acid, on the decomposition 

 of, by sunlight, 358. 



Sulphocyanides, on the action of 

 nitric and nitrous acids on the, 

 228. 



Sulphur, on a delicate test for, 327. 



Sylvester (Prof.) on Newton's rule 

 for determining the number of 



