INDEX, 



565 



Colloidal substances, on the properties 

 of, 314. 



Covariants, on the operating symbol 

 of differential, 205. 



Croll (J.) on the physical cause of the 

 change of climate during geological 

 epochs, 121. 



Crystallization, observations on, 383. 



Crystals, on the biaxial character of 

 pyramidal and rhombohedral, 190. 



Damour (M.) on the density and re- 

 fractive index of some zircons, 234. 



Davy (Dr. J.) on certain charges made 

 against Sir H. Davy, 480. 



Davy lamp, on the theory of the, 227. 



Debray (M.) on some crystallized 

 arseniates and phosphates, 232. 



Delafontaine (M.) on thorium and 

 its oxide, 228. 



De la Rue (W.) on eclipse photo- 

 graphs, 477. 



Didymium, on the inversion of the 

 absorption bands in the spectrum 

 of, 246. 



Donkin (Prof.) on certain statements 

 concerning the specific heat of 

 gases, 458. 



Dove (Prof.) on a new polarizing 

 prism, 247 ; on the optical proper- 

 ties of carthamine, 247. 



Draper (Dr. H.) on the photographic 

 use of a silvered-glass reflecting 

 telescope, 249. 



Dufour (L.) on the boiling of water, 

 and on the explosion of steam- 

 boilers, 78, 324. 



Earth currents, observations on, 140. 



Electrical condensers, on the residual 

 charge of, 7b\ 



phenomena, on the relation of 



earth currents to, 140. 



sparks, on the thermal action 



of, 1. 



Electrolysis, on the verification of the 

 law of, 563. 



Emeralds, on the colouring matter 

 of, 167. 



Energetics, on the history of, 404. 



Energy, historic notes on the conser- 

 vation of, 311. 



Evansite, on the new mineral, 341. 



Flowers, on the respiration of, 167. 



Fluid, on some effects produced by a, 

 in motion, 209. 



Forbes (D.) on Evansite, a new mine- 

 ral species, 341, 



Force, on the history of, 470. 

 Gadolinite, on some combinations of, 



145. 

 Gases, on the dynamic radiation of, 

 99 ; on the law of the expansion of, 

 by increase of temperature, 271 ; 

 on phenomena observed in the 

 spectra produced by the light of 

 induction-currents in rarefied, 408 ; 

 on the specific heat of, 458. 

 Gasometer, on a new mercurial, 235. 

 Gassiot (J. P.) on a train of eleven 

 sulphide-of-carbon prisms arranged 

 for spectrum analysis, 69. 

 Gaugain (J. M.) on the residual 

 charge of electrical condensers, 7Q. 

 Geological Society, proceedings of 



the, 72, 159,241,321,562. 

 Gernez (D.) on the rotatory power of 

 active liquids and of their vapours, 

 243. 

 Gill (J.) on the dynamical theory of 



heat, 367. 

 Gismondine/ on the crystalline form 



of, 505. 

 Glacial epoch, on the physical cause 



of the, 121. 

 Graham (T.) on the properties of sili- 

 cic acid and other colloidal sub- 

 stances, 314. 

 Gravitation, observations on, 475. 

 Gun-cotton, observations on, 535. 

 Haidinger (Dr. W.) on the meteorite 



of Albareto, 327. 

 Heat, on the dynamical theory of, 

 25, 150, 288, 311, 367, 470; on 

 the absorption and radiation of, by 

 gaseous and liquid matter, 81, 438, 

 508, 554 ; on the relative amounts 

 of, produced by the combination of 

 ordinary and ozonized oxygen, 1 06 ; 

 on the general nature of, 425 ; on 

 the measurement of the quantities 

 of, absorbed in electro-chemical 

 decompositions, 551. 

 Herschelite, on the crystalline form 



of, 506. 

 Hittorf (Dr. S. W.) on the spectra 



of ignited gases and vapours, 64. 

 Huggins (W.) on the spectra of some 



of the fixed stars, 1.52. 

 Hydrogen, on the action of, on metal- 

 lic solutions, 226 ; on the radiation 

 from a flame of, 329. 

 Induction in a rotating conductor, 

 on, 347. 



