CONTENTS, 



JULY, 1803. 



Kngravings of the following Objects: 1. Compensation Pendulum; by Mr. 

 Henry Kater : 2. Representation of an Irregular Production of the Cucumber; 

 3. Mr. Mathew's Scapement: 4. Planche's Apparatus for Succinic Acid. 



I. An Essay on Polygonal Numbers, containing the DemonRtration of a Pro- 

 position respecting Whole Numbers in general. In a Letter from John 

 Gough, Esq. - - - - - - - 161 



II. On a Variety of the Brassica Napus, or Rape, which has long been culti- 

 vated upon the Continent. By Mr. James Dickson, F. L. S. V. P. H. S. 168 



III*. Comparative Analysis of some Varieties of Steatite, or Talc. By Mr. 

 Vauquelin - - - - - - - 170 



IV. Observations on the Crystallized Substances included in Lavas. By G. A. 

 Deluc - ^ ------ 176 



V. Experiments on Molybdena. By Christian Frederic Bucholz 188 



VI. Remarks on the Formation of Acetous Acid in Cases of Indigestion. By 

 Mr. Pe/peres, Apothecary, at Aziles. Communicated by Mr. Parmentier 



196 



VII. On the Cause of Animal Heat. In a Letter from a Correspondent 200 



VHI. Description of a Species of Ox, named Gaval. Communicated bv 

 H. T. Colebrook, Esq. - - -' - - 2o''l 



IX. A concise Method of determining the Figure of a gravitating Body re- 

 volving round another. By a Correspondent - , . " 208 



X. Description of a new Compensation Pendulum. By Lieutenant Henry 

 Kater. Communicated by the Author - - - 214 



XI. Extractor a Letter from Mr. J. Aston of Ipswich, giving an Account of 

 a Mule Cucumber, and otiier Objects - - - - 221 



XII. Letter from Professor Vince, in Reply to Dytiscus - - 222 



XIII. Certain Improvements in Chronometers, by Daniel Dering Mathew, 

 Caius College, Cambridge. In a Letter from the Author - 224- 



XIV. Observations on the Possibility of collecting a certain Quantity of Suc- 

 cinic Acid, during the Preparation of Amber Varnish, without any Injury 

 to the Quality of the Varnish. By Mr. Planche, of the Society of Apothe- 

 caries, Paris _-----. 227 



XV. An Es^ay on the Saccharine Diabetes. By Messrs, Dupuytren and The- 

 nard. Abridged by tiie Authors , . . . 230 



XVI. Letters from Mr. Roloff, of Magdebourg, on the fetid Resin of Sul- 

 phur - - - 237 



Scientific News - - - - - - - - 238 



Metcorolo^cal Tables ---.,. 240 



AUGUST, 



