CONTENTS. Tii 



AUGUST, 1807. 



Engravings of the following Objects : 1 . Mr. Field's Stove for Heating or Dry- 

 ing. 2. Mr. Waistell's Horse Hoe. 3. Mr. Curwen's Weed Harrow. 



I. A Memoir on two new Classes of Galvanic Conductors. By Mr. Erman 



Page 233 



II. Facts toward a History of Prussiates. By Mr. Proust - 249 



III. An Account of a Stove for Heating Rooms, or Drying different Articles;. 

 By Mr. G. Field, of Newman Street - - - 263 



IV. Inquiries concerning the Oxidations of Iron. By Mr. Darso - 267 



V. Account of Mr. Curwen's Drill Horse Hoe, or Weed Harrow 281 



VI. Account of a Drill Horse Hoe for Turnips, communicated by Mr. Charles 

 Waistell - - - - - 284 



VII. On Capillary Action. By Mr. Laplace - - 286 



VIIT. Letter from Mr. Delaville, M. D. of Cherbourg, to Mr. Vauquelin, 

 Member of the Institute, on the Oxidation of Metals, and particularly on that 

 of Lead - - - - - - 29T 



IX. An Essay on Instinct, read to the French National Institute. By Mr. Dupont 

 de Nemours - 229 



X. Observations on the Sulphurous Acid. By Mr. Planch e. Read to the Soci- 

 ety of Pharmacy, November the 15th, 1806 - - 303 



XI. Scientific News : French National Institute * - 306 



SUPPLEMENT 



