VI t CONTENTS. 



Variation of the INIagnet at KharkofF 1 5S 



Origin of the North American Indians ibid. 



A Substitute for Tea ibid. 



Miaszite ibid. 



Gum in Lichens ibid. 



Extraordinarv Fog 154 



Queries by a Correspondent answered 155 



Test for Arsenic 1 56" 



Iodine ibid. 



Meteorological Tables at Kinfauu's Caslle 157 



New Patents 158 



Scientific Rooks in hand ibid. 



Meteorological Table, Dec. 14 to Jan. 12 169 



NUMBER XV.— MARCH. 



Biographical Account of M Tobias Lowitz l6l 



On the Population of Russia, and its Progress. By C. T. Hermann l65 



Remarks on the Essay of Dr. Berzelius on the Cause of Chemical Propor- 

 tions. By Mr. J Dalton 174 



On the Porcelain Earth of Cornwall. By Dr. Fitton 180 



On Sulphuret of Carbon. By Dr. Berzelius and Dr. Marcet 1 85 



Account of some Properties of Light. By Dr. Brewster igO 



On the Ventilation of Coal-Mines By Mr. John Taylor I96 



On the Electricity of Paper. By Mr. Walsh .' 203 



On the Antilunar Tide. By Mr. Campbell, concluded 204 



On the Limits of perpetual Snow in the Norrh. By M. Von Buch .... 210 



Astronomical and Magnetical Variations. By Col. Beaufoy 220 



Critical Analysis of the Memoirs of the Imperial Academy of Sciences at 



Petersburgh 222 



Proceedings of the Royal Society, Jan. 27, Feb. 3, 10, and 17 226 



Linnaean Society, Feb. 1 and 15 230 



Imperial Institute of France 231 



New Geological Society in Cornwall 234 



Coloured Halo round the Moon ibid. 



Of the Extraordinary Fog 2.35 



Of Arsenite of Silver 236 



Of the late Storm 237 



New Patents 238 



Scientific Books in hand ibid. 



Meteorological Table, Jan. 13 to Feb. 11 239 



NUMBER XVI.— APRIL. 



Biographical Account of M. Malus. By M. Delambre 241 



Essay on the Cause of Chemical Proportions. By Dr. Berzelius, continued 244 



Letter t>om M. Mains, on his new discoveries respecting Light 257 



On the Population of Russia, and its Progress. By C. T. Hermann 26O 



Meteorological Journal at Derby and Sidmouth 274 



Experiments on Light. By Dr. Reade 276 



Astronomical and Magnetical Observations. By Col. Beaufoy 280 



Vindication of the Attack on Don Joseph Rodriguez' Paper in the Philoso- 

 phical Traniactione. By Olinthus Gregory, LL. D 282 



