( 415 ) 
INDEX. 
A 
Acetic acid, crystallisation of it by pressure, 401. 
Achmite, a new mineral, description of, 55. 
Acid, earth in Persia, 403. 
Aerolites , mineralogical description of some which fell near Wiborg* 
333. 
Adriatic, Tour to the coast of the, 82. 
Amber, insects in, 408. 
America, North, on the slave population of, 63. 
Amici, Professor, his observations on double stars, 334. 
Ammonia condensed into a liquid, 384. 
Anthracite, on the fusion of, 175. 
Antimony, on the development of magnetism in bars of, by unequal 
heating or cooling, 167. 
A Apennines, on the geognostical structure of, 153. 
Asiatic Society of Great Britain and Ireland instituted, 205. 
Astronomy, practical. Dr Pearson’s introduction to, announced, 392. 
Atlas of the Russian empire, 206. 
Atmospheric air converted into a fluid by pressure, 401. 
— — — — pressure , on its influence upon the bulbs of thermometers* 
Babbage, Mr, his calculating engine, 197* 397* 
Barometer, on the periodical rise and fall of, within the Tropics, 398. 
— extraordinary depression of in February 1823, 400. 
Barton, Mr, his iris-metal ornaments, 410. 
Becqaerel, M. on the production of electricity by pressure, 396. 
Berthollet, M. biographical memoir of, 1. 
Bitumen in minerals, 403. 
Blainville, M. on the shell of cephalated mollusca, 359* 
Borgesen , Rev. U. F., his description of Vettie’s Giel in Norway, 2 99* 
Boracic acid discovered in tourmaline, 402.— on the varying quantity 
of it in tourmaline, 402. 
Boue, Dr, on the comparative geology of the south of France and 
south of Germany, 128. 
Bowdich, Mr, on the measurement of the progress of an eclipse of the 
moon by a sextant, 57. — on the geognosy of Madeira and Porto 
Santo, 315. 
Brazil, geognosy of, 208. 
Brewster, Dr, on the existence of two new fluids in minerals, 94, 400. 
— on the existence of moveable crystals in a fluid cavity in quartz* 
268,— on the phosphorescence and structure of the Chara vul- 
garis, 194 — his reply to Mr Brooke’s observations on the optical 
system of mineralogy, 36 1 . — on the identity of Paranthine and 
Wernerile, 388, 
1 
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