( 453 ) 
INDEX. 
A 
Alcohol found in pyrolignous acid, 448. 
Alimentary canal, on \he 9>l\. 
Allan, Thomas^ Esq. on a vegetable impression from Graigleith, 42S. 
Alloys of platinum, 202. — of potassium, on tlieir movenients upon 
water, 389- 
Ammonia, bicarbonate of, 444. 
Ampere, M. account of his discoveries respecting electric currents, 
173 . — ^his apparatus for conducting electro-magnetic experiments 
described, 406. — his electro-magnetic telegraph, 435. 
Amphiboles, on the analysis of the, 21. 
Anderson, Mr A. on the dip of the horizon, 331. 
Antidote against poisons, 221. 
Antiseptic power of the pyrolignous acid, 344. 
Apophyllite, on the nature of the tints which it polarises, 337‘ 
Arctic regions, Franklin’s expedition to, 141. — Parry’s ditto, 144. — • 
distribution of heat in the, 193, 422. 
Astatic needle described, 414. 
Astronomical Society of London, 432. 
Automaton chess-player analysed, 393. 
Ana, account of a map of the country north of, 76 . 
Axe, a clay-slate one found in a whale, 21 6 . 
B 
Bahhage, Charles, Esq. on games of chance, 421. 
Barnsjield, Mr Edward, account of his voyage to New South Shet- 
land, 345, 
Beaufoy, Colonel, on the variation of the needle, 188, 417* — on the 
going of a clock with a wooden pendulum, 355. — on the occulta-^ 
tion of ^ pispes, 429. 
Beccaria on the double refraction of rock-crystal, J30. 
Bee-hives, method of constructing, J09« 
Bees, observations on, 133. 
Belzoni on an annular eclipse of the sun, 197 ^—- on the mummy-pits 
of Thebes, 220. 
Berzelius on the ferruginous and sulphuretted prussiates, 1.6. 
Biot, M. his experiments on electro-magnetism, 175. 
Bohnenherger* s electrometer described, 324. 
•Bottle picked up on the coast of Brazil, 223. 
Boues geology of Scotland, 213. 
Bowwan, Mr R. of Irthington, account of, in the 115th year of his 
age, 67 . 
Brewster, Dr, on Comptonite, a new mineral from Vesuvius,! 31. — 
on a new double micrometer, 164. — on the distribution of heat in 
the arctic regions, 193.— on crystals with two axes of double re- 
fraction, 334.— on native hydrate of magnesia, 352.— on tiie pro« 
