iv CONTENTS. 



Page 

 pound of Iodine, Carbon, and Hydrogen. By Mr. Faraday, Chemical 



Assistant in the Royal Institution 104 



Experiments to determine the Atomic Weight of various Metals and 



Acids. By Thomas Thomson, MD. FRS 120 



Description of some Minerals found on the newly discovered Antarctic 



Land. By Dr. Thomas Stewart Traill 147 



On Carburet of Nickel. By Mr. Irving 149 



Proceedings of the Royal Society, July 5, and 12 149 



Geological Society, May 4 150 



Third Report of the Commissioners appointed by his Majesty to consider 



the Subject of Weights and Measures 152 



Potash from Potatoe Stalks 154 



Chromic and Sulphuric Acids 155 



Process of analyzing Gunpowder 156 



New Scientific Books 157 



New Patents 158 



Mr. Howard's Meteorological Journal for June 1 59 



NUMBER III.— SEPTEMBER. 

 On the Geology of the Neighbourhood of Okehamp'.on, Devon. By the 



Rev. J. J. Conybeare 10' I 



On the Aeriform Compounds of Charcoal and Hydrogen. By Dr. Henry l6'7 

 On the Production of Colours by Mechanical Division. By Mr. J. P. 



Charlton 182 



On the Lacerta Gigantea of the Ancient World. By S. T. Von Summer- 

 ing. (With a Plate.) 1 83 



Historical Sketch of Electro-magnetism 195 



On Oxide of Manganese found in the Neighbourhood of Newcastle-upon- 

 Tyne. By Mr. N. J. Winch 200 



Tables of Temperature, and on the Causes of Calorific Capacity, Latent 



Heat, &c. By John Herapath, Esq. {continued) 201 



On a Method of expressing Chemical Compounds by Algebraic Charac- 

 ters. By Mr. Charles Sylvester 212 



On tbe Geology of Headen Hill, IsleofWight. ByG.B. Sowerby, FLS. 216 



On Arragonite. By Dr. Daubeny 220 



On a Crystalline Sublimate from Oil of Cinnamon. By Mr. Turner 222 



Astronomical Observations. By Col. Beaufoy, FRS 223 



Remarks upon Mr. Herapath's Theory 223 



Analytical and Critical Account of the Philosophical Transactions of the 



Royal Society for 1821, Part 1 227 



Proceedings of the Geological Society, June 1 232 



Gas from Cocoa Nut Oil 235 



On the Crystallization of Sugar under a particular Circumstance. By M. 

 Braconnot 235 



