IV CONTENTS. 



Page 

 On the Employment of Metallic Sulphurets in Analysis, by 



Mens. E. F. Anthon 137 



On the Fermentation of Sugar of Milk, by M. Hess 139 



Formation of Nitre in Extract of Quassia, by M. Planche .... 140 



Method of dissolving Iridium, by M. Fellenberg 141 



On Lactic Acid in Sour-Crout, by M. Liebig 142 



Meteorological Observations made at the Apartments of the 

 Royal Society by the Assistant Secretary ; by Mr. Thomp- 

 son at the Gardens of the Horticultural Society at Chiswick, 

 near London ; and by Mr. Veall at Boston , . . . 143 



NUMBER LXXin.— FEBRUARY. 



Mr. H. F. Talbot on a new Property of Nitre 145 



The late Colonel Francis Hall's Meteorological Observations 

 made during a residence in Colombia between the Years 1 820 



and 1830 148 



Dr. Dalton's Sequel to an Essay on the Constitution of the 

 Atmosphere, published in the Philosophical Transactions for 



1826 ; with some Account of the Sulphurets of Lime 158 



Mr. Lubbock on the Divergence of the numerical Coeffi- 

 cients of certain Inequalities of Longitude in the Lunar 



Theory 168 



Dr. M. J. Schleiden's Observations on the Development of the 



Organization in Phsenogamous Plants 172 



Mr. F. Watkins on Electro-magnetic Motive Machines 190 



C. H. Matteucci's Physical, Chemical, and Physiological Re- 

 searches relative to the Torpedo ; and some Remarks on the 



Contractions of the Frog 196 



New Books : — Hood's Practical Treatise on Warming Build- 

 ings by Hot Water, with some remarks on Ventilation ; — 



Curtis's Guide to an Arrangement of British Insects 202 



Bibliographical Bulletin 203 



Proceedings of the Royal Society, Zoological Society 204 



Preparation of Protoxide of Tin 216 



Preparation of Bicarbonate of Potash, by Prof. Woehler 216 



New Locality of Arsenical Copper in Chili, by Von Zinken. . 217 

 Definite Combination of Oxide of Silver and Oxide of Lead, by 



Prof. Wcehler 217 



A new Method of obtaining Chrome Alum, by R. F. Marchand 218 



Examination of Malt liiquors, by Prof. Fiichs 218 



On some new Compounds of Chlorine, by M. Heinrich Rose. . 220 

 New Acid formed by the Combustion of Alcohol around an in- 

 candescent Platina Wire 220 



On Gentianin, by M. Trommsdorff 221 



On Quassin 222 



Needles rendered magnetic by the Nerves 223 



Meteorological Observations. 223 



