INDEX. 
ACHEN mass of native iron, re- 
covery of, 53. 
Accum, Mr. F. on the method of illu- 
' minating the streets with coal gas, 
16. 
Acharius, Dr. on’ two new genera of 
lichens, 455. 
Acidity and Alkalinity, on, 187. 
Adhesive slate, absorption of gases by, 
250. 
Africa, voyage of discovery to, 392. 
Agaric, mineral, absorption of gases 
by, 251. 
Ailsa, craig of, structure of, 61. 
Air, resistance of, to differently shaped 
bodies, 277. 
Alcyonia, fossil, some new varieties 
of, 59. 
Amalgam of mercury and hydrogen, 
234. 
Animal concretion, 397. 
Apothecaries, regulations for the exa- 
mination of, 387. 
Arragonite, crystals of, 235. 
Asbestus, ligniform, absorption of 
gases by, 250. 
Assynt, lime-stone formations af, de- 
scribed, 60. 
Astronomical observations, 51, 293. 
—— circles, improved method 
of dividing, 136. 
Athens, climate of, T1—-school of, 77. 
Atkinson, Mr. observations by, on Mr, 
Lockhart’s imaginary cube roots, 
72, 309. 
Atlantic, north, temperature of, 396, 
Auguste de St, Hilaire, M. botanical 
observations by, 223. 
Azotic gas, specific gravity of, 321, 
B. 
Babbage, C. Esq. ow the calculation of 
functions, 68. 
Bakewell, Mr. account of a coal-field 
near Manchester, by, 56, 
Beaufoy, Col. astronomical and mag- 
netical observations, by, 51, 133, 
218, 293, 379—description, by, of an 
instrument to measure and register 
the rise and fall of the tide through 
out the whole flow aud ebb, 273, 
1 
_Beaufoy, Henry, Esq. instrument, by, 
to ensure the attention of watchmen, 
Al8. 
Beauvois, M. de, 
plants, by, 148. 
Bended tabular rents, junction of, 43. 
Bennett, Hon, Henry Grey, account of 
Teneriffe, by, 57. 
Benzenburg, Dr. on the recovery of the 
Aachen mass of native iron, 53. 
Berneaux, M. Thiebaud de, botanical 
observations, by, 225. 
Berzelius, Professor, letter from, to 
Professor Gilbert, 47 — objections, 
by, to Davy’s theory of chlorine, 
211. 
Blackfriars bridge, numbers that pass 
it ina day, 71. 
Blumenbach’s arrangement 
human species. 151, 
Boracic acid, native, Tl. 
Bossut, Charles, biographical account 
of, 401. 
Brain, on the functions of, 136, 
Brewster, Dr. on the multiplication of 
images and colours which accompany 
them in some specimens of Iceland 
spar, 68—on the new properties of 
light exhibited in the optical pheno- 
mena of mother-of-pearl, and other 
bodies to which the superficial struc- 
ture of that substance can be com- 
municated, 135—on the effect of 
heated and cooled glass on light, 
136, 219—on the depolarization of 
light, 220—on pressure, 221—on the 
polarization of light by reflection 
from different transparent bodies, 
222. 
Brotero, Don Felix, on the genus 
passiflora, 455, 
Bucholz,. Professor, experiments on 
tungsten, by, 198, 
observations on 
of the 
Cc 
Cambridge, objects of study at that 
University, 294, 
Camera lucida, new and important 
combinations with, 281, 
Canaries, population of, 396, 
Carbonate of bismuth, 236, 315, 
