INDEX. 



469 



306 ; combination of, with prussiate 



of potash, 385. 

 Chlorophaeite, 387. 

 Chromium, brown oxide of, 307. 

 Chrysolite in the cavities of obsidian, 



66. 

 Cinchonia and quina, gallates of, 147. 

 Citric acid from gooseberries, 152. 

 Cobalt, arseniate of, 75. 

 Cold, artificial, Mr. Walker on, 11. 

 Collimator, Kater's, horizontal floating, 



Mr. Nixon on, 218. 

 Combustion, heat developed during, 67. 

 Comet, Encke's, 464. 

 Conia, preparation of, 231. 

 Corydalin, a new vegetable alkali, 151. 

 Crystalline state, alteration of, in solids, 



155. 

 Crystallization, influence of the air in, 



215. 

 Crystals, anhydrous, of sulphate of soda, 



71. 

 Cullen (Capt. W.) on the geological 



features of a route from Madras to 



Bellary, 357, 435. 

 Cupreous salts, effect of ebullition on, 



232. 

 Cycadeoideae, a new family of fossil 



plants, 225. 

 Dakin (G.) on the microscopical exa- 

 mination of opaque objects, and on a 



focimeter, 429. 

 Dalby's method of finding longitudes, 



employed in the Trigonometrical Sur • 



vey, Dr. Tiarks on, 364. 

 Dalton (J.) on the height of the aurora 



borealis, 418. 

 Davy (Sir H.) on the phaenomena of 



volcanoes, 85. 

 De la Beche (H. T.) on Oltmann's ta- 

 bles for calculating heights by the ba- 

 rometer, 194. 

 Del Rio, (Prof.) his analysis of two 



new mineral substances, 113. 

 Deutoxide of manganese, 34. 

 Dunn's (J.) improved air-pump, 145. 

 Dunnochgoil, Mr. S. Sharpe on the 



vitrified fort of, 123. 

 Dynamics, 338. 



Earth, ellipticity of the, 179, 364; fi- 

 gure of the, 189, 24], 245, 443. 

 Earthquakes, 55, 56. 

 Echeveria, new account of the genus, 



261. 

 Electricity, conducting power of metals 



for, 382. 



, voltaic, conducting power of 



fluids for, 383. 

 Electro-magnetism, 220, 458. 

 Ellipticity of the earth, Mr. Galbraith 



on, 179, 364. 

 Encke ( Prof.) on the new Berlin Astro- 



nomical Ephemcris, 141, 248; on 

 the occultations of stars by the moon, 

 409. 



Encke's comet, 464. 



Entomology, 278, 343, 444. 



Ephemeris, astronomical, new, 141,248. 



Equations, adfected quadratic, method 

 of solving, 125. 



of the second degree, on Va- 



rignon's method of solving, 314; of 

 all dimensions, resolution of, 371 ; of 

 the third degree, on Laplace's method 

 of solving, 462. 



Equitable Society, letter to Mr. Morgan, 

 on the experience of, 339. 



Erinite, a new mineral, 154. 



Eudiometrical apparatus, Dr. Hare's 

 improved, 126, 183. 



Fayolle on the figure of the cells of the 

 honeycomb, 233, 313; on Varignon's 

 method of solving equations of the 

 second degree, 314 ; on Laplace's 

 method of solving equations of the 

 third degree, 462. 



Ferrybridge, Mr. J. Phillips on the 

 geology of the neighbourhood of, 401 . 



Figure of the earth, on the, 189, 241, 

 245, 443. 



' of the cells of the honeycomb, 

 19, 233, 313. 



Fischer on the action of acids on pal- 

 ladium, 230. 



Fluids, conducting power of, for voltaic 

 electricity, 383. 



Focimeter, Mr. Dakin on 431. 



Forster (Dr.) on the zodiacal light of 

 the 29th September, 389 ; on the lu- 

 minous belt of September 29th, 463. 



(B. M.) on preserving funguses, 



312. 



Fossil fish, 223 ; plants, new, 225 ; rep- 

 tiles, 236, 312. 



Funguses, method of preserving, 312. 



Fyfe's (Dr.) Elements of Chemistry, 

 review of, 50. 



Galbraith ( W.) on the velocity of sound, 

 and on the ellipticity of the earth, 

 179; Prof. Airy in reply to, 364. 



Gallates of quina and cinchonia, 147. 



Gauss ( Prof. ) on the representation of 

 the parts of a given surface on another 

 surface, 104, 206. 



Gelatine and albumen, vegetable, 69. 



Geology, 12, 38, 81, 222, 235, 294, 355, 

 374, 401, 435. 



George's (E. S.) examination of the sub- 

 stances connected with an Egyptian 

 mummy, 291. 



Gilbert (Davies) on the luminous belt 

 of 29th Sept., 453. 



Gooseberries, citric acid from, 152. 



Graham (T.) on the influence of the 



