INDEX. 
433 
Light, influence of, in the developement of magnetism, 239. — ^history 
of the polarization and double refraction of, 289. 
Lizard, live one found in a seam of coal, 214. 
M 
MacCulloch, Dr, on the colouring of agates, 341. 
Magnesia alba, analysis of, 243. — subsulphate and submuriate of, 252 
Magnetic observations made during the Arctic expedition, 208. 
Magnetism of mica, 206. 
— new discoveries respecting, 344. 
Mauvoisin, formation of the Lake of, 187* 
Mediterranean, positions of thirty-four places in the, 322. 
Maximilian, Prince, his travels in Brazil, 340. 
Memnon, statue of, 419* 
Memnonium, account of the, 40. 
Metallurgy, Lampadius on, 212. 
Meteoric stones, list of those which have fallen, down to 1819^ 223. 
Mica, magnetic qualities of, 206. 
Micrometers, asbestus fibres recommended for, 202. 
Microscopes, single, a new method of making them of glass, 82. 
Miner alogical Society of Dresden, 211. 
Minerals, phosphorescence of, 383. 
Moon, libration of, 198« 
Morey s, Mr, new revolving steam-engine, 348. 
Morichinis experiments on the magnetising influence of the violet 
rays, 239- 
Mud, detonating, account of, 423. 
Mummy-pits, 36. 
Murray, Mr, on the course of the Niger, and on the interior of Afri- 
ca, l63. 
Musical sounds from granite rocks, 413. 
N 
Nadelstein, pyro-electricity of, 205. — difference between nadelstein 
and mesotype, 206. 
Nautical top, description of, as constructed by Mr Troughton, 105. 
Neill, Mr, proofs by, that the beaver was formerly a native of Scot- 
land, 177- 
Niger, course of, l64. 
O 
Opium, preparation of in Great Britain, 258. — In India, 427. 
Optical illusion seen in Baffin’s Bay, 202. 
Orrery, account of a new one, 410. 
Oxygenated water, properties of, 208. 
P 
Fauna, description of the diamond mine of, 49. 
Patents, list of in Scotland, 219, and 428. 
Pelletier and Caventou on anew vegetable alkali, 210. 
Pendidum, seconds, comparison between the length of, as determined 
by Mr Whitehurst and Captain Kater, 75.— on the length of, ob- 
served at Unst, 77. 
