CONTENTS. X 



VIII. On the Chemical Effeas of the Pile of Volta. By a Correfpondent 



p. 472 



IX. Memoir of feveral newly difcovered Properties of phofphorated Hydrogen 

 Gas. By Citizen Raymond, Profeffor of Chemiftry at the Central School of 

 the Department of the Ardeche - - p. 474 



Scientific News, Accounts of Books, &c. - - p. 475 — 480 



Premiums ofTereJ by the Board of Agriculture. — Prizes offered by the Clafs of Mathematical and 

 Phyfical Sciences of the Nalional Inftitute of France in its Public Sitting, 15th Germuial in the 

 year 8 (April 4, 1800.) — Candles with wooden Wicks. — Ink capable of refifting the Aftioaof 

 Oxygenated Muriatic Acid. 



FEBRUARY 1801. 



Engravings of the following Objefls : 1 . An improved Hydraulic Engine, by- 

 Mr. Clofe. 2. The Duke of Bridgewater's underground inclined Plane. 3. 

 Figures illuftrative of Galvanic Difcoveries. And, 4 Mr. Home's Exhibition 

 of the Structure of that fingular Animal the Ornithorhynchus paradoxus. 



I. Obfervations on a Method of reftoring the Utility of Wells, which have been 

 abandoned in confequence of the Mephitization of the Ground. By Cit. 

 Cadet-de-Vaux, of the Society of Agriculture of the Department of the Seine 

 in France) Communicated at the Sitting of that Sgciety on the 16 Brumaire, 

 in the Year 8 - - - - ,- p. 481 



The method confifts in boring and then driving a wooden pipe into the cavity. Through this pipe 

 the borer is made to aft and increafe the depth. Another pipe is driven in fo as to fink the firfl 

 ftill lower. By a continuation of this procefs the length of pipe is carried to very great depths, 

 if neceffary, and water is conduded from the lower fprings to the furface. 



II. Memoir of feveral newly difcovered Properties of Phofphorated Hydrogen 

 Gas. By Citizen Raymond, Profeffor of Chemiftry at the Central School of 

 the Department of the Ardeche. (Concluded from page 475) p. 483 ■ 



III. Defcription of the underground inclined Plane, executed atWalkden Moor 

 in Lancafhire, by His Grace the Duke of Bridgewater. By the Rev. Francis 

 Egerton - - - - p. 486 



IV. Concerning the Engine for raifing Water by the lateral Communication of 

 Motion. In a Letter from the Inventor, Mr. William Clofe p. 493 



V. On the Power of penetrating into Space by Telefcopes ; with a comparative 

 Determination of the Extent of that Power in natural Vifion, and in Telefcopes 

 of various Sizes and Conftrufilions ; illuftrated by fele£l Obfervations. By 

 WilHamHerfchel, LL.D. F.R.S. - - p- 496 



3. VI, Some 



