Of WATER by HEAT. 389 



Experiment II. 



I filled the fame jar with water of temperature 53 ; and 

 that I might obferve the phenomena of cooling, I placed it in 

 the axis of a much larger cylindrical veffel, nearly full of water, 

 of temperature 41 , and, by an earthen- ware fupport, raifed it 

 about three inches from the bottom, taking care that the water 

 fhould be on the fame level in both vefTels. As foon as I had 

 adjufted the two thermometers, as in the former experiment, I 

 obferved that the top of the fluid was flill at 53 °, but the bot- 

 tom, had fallen to 49 °. 





Top. 



Bottom. 



In 9 minutes, 



52° 



45 



— 15 



5 2 



44 



Now, to accelerate the cooling, I withdrew by a fyphon the wa- 

 ter from the large cylinder, and fupplied its place by ice-cold 

 water, mixed with fragments of ice, which by repeated cautious 

 agitation was kept uniformly at the temperature of 32 °. 



In 23 minutes, 48 ° - 42-f- 



— 3 8 44 " 40 



— 43 4 2 * 40 



— 46 — * 40 - 40 



— 5 2 3 6 - 40 



— 58 35" - 39 



__6 5 34 . 37 



— 75 34 - 36 



- 103 34 - 34 



This 



