Yl CONTENTS. 



NUMBER XC v.— NOVEMBER. 



Page 



Description of Chromate and Bichromate of Potash. By Thomas Thom- 

 son, M.D. F.R.S 321 



On the true Vv'ciglit of the Atoms of Baryles, Potash, Soda, Lead, Sul- 

 phuric Acid, Nitric Acid, Muriatic Acid, and Chromic Acid. By 



Thomas Tliomson, M.D. F.R.S 327 



On the Atomic Theory. By Dr. Macneven {concluded) 338 



On the Mathematical Principles of Chemical Philosophy. By Mr. Em- 



mett. With a Plate, {continued) 351 



On the Invention of Alphabetic Writing. By A. Carmichael, M.R.I.A. 358 

 Comparative View of Mean Temperature at different Places in Great Bri- 

 tain. By Dr. John Forbes 370 



On the late Solar Eclipse. By Mr. James Fox 372 



On a pretended Self-moving Engine. By Mr. Thomas Gill 373 



New Electromagnetic Experiments. By Prof. Oersted 375 



Observations on the Ventilation of Mines. By Dr. M'Sweeny 377 



Analytical and Critical Account of the Philosophical Transactions of the 



Royal Society of London, for 1 820, Part 1 379 



Remarkable Petrifaction 388 



Remarkable Instance of Spontaneous Combustion SgO 



Urea ' 300 



Laccin 39 1 



Dry Rot -392 



Cantharadin 393 



Fossil Bones in Old Red Sandstone 393 



Explanation of the Word Calomel 394 



New Scientific Books 304 



Col. Beaufoy's Mao;netical, Meteorological, and Astronomical Observa- 

 tions, for Scjjtember 39^ 



Mr. Howard's Meteorological Journal for September 399 



NUMBER XCVL— DECEMBER. 

 Chemical Analysis of the Necdlcstone from Kilpatrick, in Dumbarton- 

 shire. By Thomas Thomson, M.D. F.R.S 401 



Observations on the late Solar and Lunar Eclipses, and the Planet Venus. 



By Dr. Bi-rney 412 



Mathematical Problem. By Mr. James Adams 418 



Reply to Mr. Boase on Rain-Gauges. By Mr. Meikle 42 1 



On the Impermeability of Wire Gauze to Flame. By Mr. Murray 424 



On the Origin of the Name of Calomel. By S. F. Gray 426 



On Polyhalite, a new Species of Saline Mineral. By M. Fred. Stromcyer. 4S7 

 On the Theory of Franklin, according to which Electrical Phenomena are 

 explained by a single Fluid. By Martin Van Marum. {\\\\\\ a Plate.) 440 



