454, 
INDEX. 
perties of melted quartz, 373, 433 . — on the properties of the 
amethyst, 421 on the temperature of the globe, 422. 
Brisbane, Sir Thomas, on determining the time of high-water accu- 
rately, 54. — on the repeating reflecting circle, 419.^ — on circum- 
meridian observations near noon, 422. 
Buhrstone from the Halkin Mountain described, 246. 
Butterflies, hermaphrodite, 212. 
Butter, Dr, on the dispersion of cataracts, 192. 
C 
Cabenda, Princesses of, 327. 
Cambridge Philosophical Society, proceedings of^ 427v 
Campbell, Mr, his second journey in Africa, 448. 
Camphor, on the movements of, on water, 389, 
Capillary tubes, on the chemical action of, 447. 
Carbonic acid found in sea-? water, 201. 
Carena on the figures formed by hoar-frost, 201. 
Cataracts, on the spontaneous dispersion of, 192. 
Catgut strings, on the manufacture of, 451. 
Cecil, Rev, Mr, on a machine driven by the successive explosions of 
gas, 427. 
Ceres, geocentric places of, 433, 
Chart of the variation and dip of the needle by Professor Hansteen, 
36s, 
Chess playing automaton of Kempelen analysed, 393. 
Chlorophceite, singular property of, 434. 
Chronometers, effect of magnetism on their balances, 199* 
Circidar polarisation, 371. 
Clarke, Dr, on ancient pigments, 427. — on a formation of natron, ib. 
Clerk, John, Esq. of Eldin, account of his Naval Tactics, 420. 
Colours, white, method of restoring them in paintings by oxygenated 
water, 204. 
Copley medal adjudged to M. Oerstedt, 229- 
Combustion of the trunks of Scots fir trees, 207* — examples of spon- 
taneous combustion, 219. 
Comet, elements of the one expected in 1822, 429- — account of the 
nev^ne of 1821, 430. 
Compressibility of water, Mr Perkins’ observation on the, 175^ 438. 
Comptonite, a new mineral, described, 131. 
Concretions, stoney, in the human muscular system, 212^ 
Conjigliachi on the Proteus anguinus, 398. 
Congo, observations on the country of^ 327. 
Crab, on the colouring matter of the shell of the, 445 — on that of 
the membrane which lines the shell, 446. 
Cryptogamous plants in Devonshire, 194. 
Crystallised salts, on the forms of, 19- 
Currents between Cape Finisterre and the Canary Islands, 241. — ou 
the submarine current at the Struts of Gibraltar, 243. 
Cuviefs^Xoge of Werner, I. 
