( 421 ) 
INDEX. 
A 
Absorption of Light by Crystals, page 243. 
Acid, pyrolignous, on the antiseptic powers of^ 21. 
Acid, pyro-uric, 313. — Sulphuric, 313. — ferro-chyazic, 313. 
Air-Pump, Nairne’s method of freezing by it, 56. 
Alkalies on five new ones, 403. 
Alloys of Steel, observations on the, 308. 
Alme, or dancing girls in Egypt, 347. 
Amarapura, map of the route between it and Tartary, 32. 
Ammonia, subcarbonate of, 315. — ^bi-carbonate of, 314. 
Analysis, chemical, 313. 
Astronomical Society, proceedings of, 189* 
Anvergne, account of the volcanoes of, 359* 
Angite, on the dichroism of, 245. 
B . 
Bagdad, extreme heat at, 197- 
Balance, hydrostatical, account of a, 401. 
Beaufoy, Colonel, on the retrograde variation of the needle, 179* — 
the monthly variation of the needle, 394. 
Bee-hive, account of a glazed one, 143. 
Bees, observations on the vision of, 67* 
on their instinct and operation, 143. 
Benzoic acid in the Tonquin bean, 407- 
Bi’-carbonate of Ammonia, analysis of, 315. 
Braconnot on the action of sulphuric acid on animal substances, 299* — ■ 
on the nitro-saccharic acid, 300. — on leucine, 300. 
Brewster, Dr, on single microscopes, 74. — on a new diagonal eye-piece, 
75.— on a singular property in the diamond, 99. — on the optical 
properties of Haiiyne, 192. — on some new species of lead-ore, 138. 
— on the phenomena of dichroism, 243. 
Bridge over the Sutlej, account of the, 220. 
Brine, method of purifying, 26. 
Bristol Institution, 202. 
Brooke, Mr H. J. on three new species of lead-ore, 117. 
Brown, Dr, on the correspondence between Mr Park and Mr Max- 
well, 102, 205. 
Brucine, a new vegetable alkali, account of, 303. — sulphate of, 304.-^ — 
muriate of^ 305. — phosphate of, 305. — nitrate of, 305. 
C 
Cambridge, Philosophical Society, proceedings of, 184, 397* 
Cameron, Mr C. on a new method of forming crucibles, 81. 
Camphor, analysis of, I99. 
Cantharidin in the Lytta vittata, 315, 
Cascade, on a remarkable one in Bavaria, 20.3. 
