xvt CONTENTS. 



JANUARY 1800. 



Engravings of the following Objefts: i. The Urceola, or Caout-chouc Plant, 

 2. The Photometer of Leflie. 3. The Hydroflatic Lamp of Keir. 



I. Account of the Improvements made on the Farm in the Great Park of his 

 • Majefty, the King, at Windfor. By Nathaniel Kent, Efq. - ?• 429 



II. Extrad of a Letter from Petrie, Efq. on Board the Good Hope In- 



diaman, at S?a, Lat. 35° 40' S. Long. 44° E. giving an Account of a Angular 

 Accident by Lightning. Communicated by Dr. Robert Petrie p. 43a 



One of the feamen was flruck by lightning, and rendered infenGble for fome minutes. The fingularity 

 of this cafe, was, that a portion of the penicranium on the right fide of the head of the fize of a dol- 

 lar, mortified and floughed off, without any previous inflammation. Remarks and obfervations. 



III. A Botanical Defcription of the Urceola Elaftica, or Caout-Chouc Vine of 

 Sumatra and Pulopinang; with an Account of the Properties of its infpiflated 

 Juice compared with thofe of the American Caout-Chouc. By William 

 Roxburgh, M. D. - . _ . _ p. ^45 



IV. On the different Sorts of Lime ufed in Agriculture. By Smithfon Tennant, 

 F.R.S. - - - - - P- 404 



The author being informed that two different kinds of lime are ufed in agriculture, in the neighbour- 

 hood of Doncafler; one of which gives fertility, and the other is deleterious to vegetation, was in- 

 duced to examine them, and found that the firft was pure lime, and the latter contained two thirds 

 magnefia. Hence he was led to inveftigate the general fcientific and agricultural relations of thefe 

 two earths, in their various, natural, and artificial compounds. 



V. Account of the ftrange Effefts produced by Refpiration of the gafeous Oxide 

 of Azote - - - - - P- 446 



From a confiderable number of inftances here Hated, it appears that this gas afts ftrongly on the fyfleip, 

 producing an increafe of nervous energy, and affedting the mind in a very remarkable manner, in 

 moll cafes producing great exhiliration. 



VI. A chemical Examination of the Bath Waters. By George Smith Gibbes. 

 (Concluded from page 404) - - - P- 45^ 



VII. Analyfis of an Iron Ore, the Compofition of which has been hitherto rnif- 

 underftood. By Mr. William Henry, including a Letter on Ores of Iron, ad- 

 dreffed to Mr. Thomas Henry, F.R.S. By Charles Hatchett, Efq. F.R.S. 



P- 454 



VIII. An Account of fome Experiments on the Fecundation of Vegetables. By 

 Thomas Andrew Knight, Efq. - - - P- 458 



IX. 



