406 
INDEX. 
line, 177*— on sulphato-tri-carbonate of lead, 183. — on calc-sinter, 
183.— on a new mineral from Aachen, 184. — on a teinoscope for 
altering the lineal proportions of objects, 334. — -on refraction with- 
out colour by two prisms of the same refractive power, 336. — on 
Leelite, 375. — on the effect of heat on rubies, 379* 
Brewsteriie, a new mineral described by Mr Brooke, 112. 
Brooke, Mr H. J. oh Comptonite, Brewsterite, Heulandite, and Stil- 
bite, 112. — on the arseniates of copper, 132. 
Brookedon, Mr, on a new method of drawing wire, 294, ^ 
Brown, Captain S., on the Trinity pier of suspension, 22. 
Brunei, Mr, his pocket copyiug-press, 293. 
Burg, Chevalier, his observations on the eclipse of 7th September 
1820, 174. 
Butter, Dr, on the insensibility of the eye to certain colours, 135. 
C 
Cahhage-plant, on the ancient history of the, 126. 
Calamine, Electric, analysis of, by Berzelius, 388. 
Calc-sinter determined to be true calcareous spar, 183. 
Calculus, account of a remarkable one, 377- 
Camphor, observations with, by Mr J. Murray, 181. 
Camphor-tree described, 399* 
Caoutchouc used for protecting steel articles from rust, 298. 
Carrot, on the ancient history of the, 262. 
Cast-iron, on its apparent conversion into plumbago, 387 • 
Cave of Kirkdale, in Yorkshire, 390. 
Cave, account of an extraordinary one in Indiana, 29* 
Celebes, earthquake at, 402. 
Chamisso, Dr, on the Coral Islands, 37. — on the volcano de Taal, 11 9. 
Chondrodite, analysis of, 388. 
Chronometers, on the effects of magnetism on, 238. 
Chrysoberyl of Haddam, 395. 
Clocks, method of lighting them with gas, I92. 
Clocks with pendulums, history of their invention, 197* 
Cloth, method of rendering it incombustible, 401. 
Comet of 1819^ its elements, 378. — its supposed transit over the sun, ib. 
Compass-needles, on the best kind of steel and form for them, 177* 
Comptonite, observations on, 1 ] 2. 
Congo, observations on, 62, 213. 
Coral Islands in the Pacific described, 37. 
Crabs, on the dark brown streaks on the sea produced by them, 195. 
Crinoidea, on the natural history of the, 186. 
Cryolite, account of it by Sir C. Giesecke, 141. 
Crystals, on the determination of certain secondary faces in them, 227. 
Cucumber, on the ancient history of the, 26*5. 
Cumming, Rev. J. on a remarkable human calculus, 377. 
D 
Darkness, account of an extraordinary, in the United States and Canada 
in November 181 9, 266. 
Detonations in Mount Brasier, 401. 
Dewey, Professor, his meteorological observations, 351. 
