xiv CONTENDS, 



during cooling; hy Thomas Yi^^Kv, junior. Com- 

 municated by Thomas Henry, F. R. S. ^c, 



P. 174. 

 Remarks on the floating of Cork Balls in 

 Water j by Mr. Banks, Lecturer in Natural 

 Philofophy. Communicated by the Rev. Thomas 

 Barnes, D.D. Fellow of the American Philojo- 

 fhical Society y at Philadelphia. - P. 178. 



Case of a Person becoming short-sighted in 

 ADVANCED Age ; by Thomas Henry, F.R.S. 

 ^c. - ~ - - - - p. 182. 



Jn Aifount of the Progress of Population, 

 Agriculture, Manners, and Government 

 /» Pensylvania. In a Letter from B-ehjamiu 

 Rush, M. D. and Profeffor of Chemiflry in the 

 Univerfity of Pensylvania, to Thomas Per- 

 civAL, M. D. F.R.S. i^c.^c. P. 183. 



A Physical Inquiry into the Powers and 

 Operation of Medicines ; by Thomas Per- 

 civAL, M. D. F. R. S. and S. A. Lond. F. R. S. 

 and R. M. S. Edinb. iic. ^c. - P. 197. 



Observations concerning the Vital Principle 3 hy 

 John Ferriar, M. D. - - P. 216. 



On the comparative Excellence of the Sciences 

 and Arts J by Mr. William Roscoe. Com- 

 municated by Mr. M. Nicholson. - P. 241. 



On the Cretins of the Vallaisj by Sir Richard 

 Clayton, Bart. - - - P. 261. 



A Descrip- 



