/ 
INDEX. 
411 
Eleclro-inagnetismj on the mathematical laws of, 281. 
Escapement, on a free one, with diminished friction, 148. 875. 
Explosion of the boiler of a steam-engine, 405. 
F 
Fallows, Rev. Fearon, on an appearance on the moon at the Cape, 
884. 
Faraday, Mr, on the alloys of steel, 850. 
Fish, on the preservation of, by sugar, 242. 
Fleming, Rev. Dr, on a submarine forest, 879* — ^^is System of Zoo- 
logy recommended, 397* 
Floetz formation the same in Britain as in Germany, 391* 
Flora Exotica by Dr Hooker, 394. 
Fluoric acid discovered by M. Berzelius in the apophyllites, 2. 
Frauenhqfer on the prismatic spectrum, 178. — on the illuminating 
power of the prismatic rays, 179- — inflexion of light, ib. 
Freyherg, on the Mineralogical School of, 273. 
Fruits, green, on their influence on the air, 248. 
Fyfe, Dr A. on the tutenag or white copper of China, 69* 
G 
Genera, Memoirs of the Natural History Society of, 192, 243. 
Geological thermometer, 376. 
Gibbsite, a new mineral analysed, 388. 
Gibraltar, on the structure of the rock of, 7 5. 
Goldingham, Mr, on the length of the pendulum at Madras, 383. 
Gordon, Mr D. on improvements on the steam-boat, 373. 
Grain, on the preservation of, in cast-iron granaries, 191‘ 
Greville, Mr R. K. on the cryptogamia of Scotland, 396* 
Groening, M. on the use of the thermometer in distillation, 214. 
H 
Hamilton, Dr Francis, on a map of the Tarout Shan territory, 71* — • 
on a map of the vicinity of Paukgan, 230. 
Harford, Mr, on puddling furnaces, 369* 
Harvey, Mr George, on Sir R. Seppings’ plan for the circular sterns 
of ships, 19* — on the house of Copernicus, 144 on the method 
of minimum squares, 292. 
Hay, Sir John, on Roman vessels found on the estates of, 55. 
Hauy, on the ordinary and extraordinary electricity of minerals, 181. 
Heat developed in solutions, 185. 
Herschel, Mr J. F. W. on a peculiarity in the extraordinary refrac- 
tion of certain varieties of apophyllite, 1 36. 
Hooker, Dr, his Exotic Flora, 394. 
Humboldt, M. on the laws observed in the distribution of vegetable 
forms, 47- 
Hungary, on the opals of, 332. — on the natron lakes in, 259. 
Hydrocyanic acid, on the antidotes against its poisonous qualities, 
1 24. 
^drogen gas, on sounds excited in, 2 80. 
Hydrogen gas proposed as the moving power of machinery, 364. 
Hyperstene, 394. 
