Of WATER by HEAT. 



399 



embraced the middle of the jar, I could, by filling it with hot 

 water, or a frigorific mixture, apply heat or cold to the middle 

 portion of the fluid in the jar, and thence, by the thermometer, 

 learn what courfe the heated or cooled fluid fhould take. 



Experiment V. 



I filled the jar with water at 32 . I placed it upon feveral 

 folds of thick carpet, previoufly cooled to the fame degree. The 

 air of the room going from 33 ° to 35 , I introduced two ther- 

 mometers, as in experiments firft and fecond. I then poured 

 water of temperature 68° into the bafon, and by means of a 

 fpout arifing from the fide of it, and a fyphon connected with a 

 refervoir of water at the temperature now mentioned, I renewed 

 the contents of the bafon frequently, but without caufing any 

 agitation. 



Bottom. 

 At commencement, 32 ° 



35 

 36- 



20 ■ ' 



In 10 minutes, 

 — 15 



— 2 5 



— 3o 

 -38 



— 45 



— 5° 



— 55 



60 



36+ 



37 

 38 

 38+ 

 39— 



39+ 

 39+ 

 39+ 



Top. 



3*° 



32 



32 



3 2 

 33 

 33 

 33 



33 

 44 



45 



48 



Air. 



33—35 



'*#* From this time I charged 

 the bafon with water of 

 temperature 88 °, and re- 

 newed it frequently. 



Nothing can be more decilive with regard to the queftion in. 

 difpute, than the particulars of this experiment. Heat is applied 

 to the middle of a column of ice-cold water. The heated por- 



Vol. V.— P. II. 3 F tion 



