INDEX. 



605 



Heat : — quantity of, evolved in chemical 

 combination, 19, 178 ; in combustion 

 of various substances, 20 ; researches 

 on, 69, 109; effect of the mechanical 

 texture of screens on the immediate 

 transmission of radiant, 69 ; on lamin- 

 ated and smoked surfaces, ib. ; on rough 

 surfaces, 76 ; on metallic and other 

 gratings, 112; on powdered surfaces, 

 114 ; transmission of, through metallic 

 powders, 118; non-metallic, 121; on 

 the analogies between the chemical 

 rays and radiant, 195 ; on the nature 

 of the change of colour of bodies by, 

 246 ; heat evolved by metallic conduct- 

 ors of electricity, 260 ; during electro- 

 lysis, 265. 



Henry (M.) on lactate of urea in urine,253. 



Henwood (W. J.) on the temperature of 

 most effective condensation (of steam), 

 60 ; on the electric conditions of the 

 rocks and metalliferous veins of Long- 

 close and Rosewall Hill Mines in Corn- 

 wall, 483. 



Herschel (Sir J. F. W., Bart.) on the ad- 

 vantages to be attained by a revision 

 and rearrangement of the constellations, 

 582. 



Hess (M.) on the quantity of heat evolved 

 in chemical combination, 19, 178. 



Hill (B.) on a new electro-magnetic ma- 

 chine, 246. 



Hopkins (T.) on the formation of the cu- 

 mulus cloud, 135. 



Hopkins, (W.) on the geological structure 

 of the Wealden district, and of the Bas 

 Boulonnais, 321. 



Hunt (R.) on the conversion of the bi- 

 sulphuret of copper into the sulphuret 

 by electricity, 442. 



Hydriodic and hydrobromic acids, process 

 for obtaining, 92. 



Hydrochloric acid, method of preparing 

 it pure, 328. 



Hydrogen, sulphuretted, spontaneous evo- 

 lution of, in the waters of the ocean, 1,8; 

 arseniuretted, 185; atomic weight of, 

 220 ; on the production of sulphuretted, 

 235 ; on the compounds of cyanogen 

 with, 449 ; on the existence of, in plants, 

 459. 



Indigo-blue, action of potassa on, 191. 



Indopten, chloruretted chloride of, 194. 



Ireland, existence of tin ore in, 27 ; of 

 gold, 28. 



Irish Academy, Royal, proceedings of the, 

 247, 584. 



Iron, action of peroxide of, on potash, 412 ; 

 action of sulphuric acid on protosulphate 

 of, 502. 



Isatin, products of the decomposition of 

 chloride and bichloride of, 192. 



Jacobi (M.) on the comparative measure 

 of the action of two voltaic pairs, of 

 M. Becquerel, 87. 



J. E. on a theorem given in the Phil. 

 Mag. for August, 380 ; solution of a ge- 

 ometrical problem on the form of the 

 black cross in biaxal crystals, 305. 



Jones (T. Wharton) on the ova of man 

 and mammiferous animals, 240. 



Jordan (T. B.) on electro-metallurgy, 

 452. 



Joule (J. P.) on the heat evolved by me- 

 tallic conductors of electricity, and dur- 

 ing electrolysis, 260. 



Kane (Dr.) " Elements of Chemistry," 

 noticed, 237 ; on the production of au- 

 dible sounds, 247. 



King (Rev. S.) on a large achromatic 

 object glass, 244. 



Knox (G. J.) on some improvements in 

 the voltaic pile, 591. 



Kuhlman (Prof.) on the silicification of 

 limestones, 332. 



Labyrinthodon from the German keuper 

 and sandstone of Warwick and Lea- 

 mington, 315, 395. 



Lactic acid and lactates, on, 333. 



Land, elevation of, on the shores of Wa- 

 terford haven, 318. 



Land-snails, agency of, in corroding and 

 making deep excavations in compact 

 limestone rocks, 541. 



Langlois (M.) on the action of ammonia 

 on red hot charcoal, 282. 



Laurent (M.) on some benzoyl com- 

 pounds, 449. 



Lassell (W.) on the observatory erected 

 at Starfield, 576. 



Lead, action of peroxide of, on cinnamic 

 acid and on salicine, 38 ; salts of, 

 formed by nitrous acid and hyponitrous 

 acid, 186; experiments on the atomic 

 weight of, and its oxides, 215 ; tartrate 

 of, 226; racemate of, ib. ; action of 

 copper on, 482 ; salts of, containing 

 acids of oxygen and azote, 598; analysis 

 of, 599. 



Lee (Dr. R.) on the nervous ganglia of 

 the uterus, 487. 



Leyden jar, on the, 595. 



Liebig (Prof.) on a new method of pre- 

 paring urea, 184 ; on the atomic weight 

 of carbon, 210; on the formation of 

 murexid, 452. 



Light, on the polarization of the chemical 

 rays of, 52 ; on the compensations of po- 

 larized, 158 ; on the theory of, 372. 



Lightning, on supposed forms of, 104. 



Lime, malates of, 308. 



Limestones, silicification of, 332. 



Logarithms, calculation of, by means of 

 algebraic fractions, 479. 



