PHYSICAL AND LITERARY. 14^ 



Art. VIL 



Of the Cold produced by E'oaporating Fluids^ and 

 of fome other Means of producing Cold -y by 

 Dr. William Cullen Frofeffor of Me- 

 dicine in the Uni'verjity oj Glafgow*. 



A Young Gentleman one of my pupils, 

 whom I had employed to examine the 

 heat or cold that might be produced by the 

 folution of certain fubftances in fpirit of wine, 

 obferved to me : That, when a thermometer 

 had been immerfed in fpirit of wine, thp' the 

 fpirit was exactly of the temperature of the 

 furrounding air, or fomewhat colder; yet, 

 upon taking the thermometer out of the 

 fpirit, and fufpending it in the air, the mer- 

 cury in the thermometer, which was of Fa- 

 renheifi conftrudion, always funk two or 

 three degrees. This recalled to my mind 

 fome experiments and obfervations of M. 

 de Mairan to the fame purpofe ; which I 

 had read fome time before. See Dijertation 

 fur la glace, edit. 1749. p^g- 248, 6? feq. 

 Vol. II. T When 



* May I. 1755. 



