in Fluids. 279 



After i hour and 15 minutes had elapsed, the Heat 

 was found to be as follows : 



At the surface of the ice . . . . . 40 



1 inch above it ....... 82 



2 inches ........ 106 



3 inches . . . . . . . 123 



The Heat of the water had hitherto been taken near 

 the side of the jar ; in the two following trials it was 

 measured in the middle or axis of the jar. 



When i hour and 30 minutes (reckoning always from 

 the time when the boiling-hot water was poured into the 

 jar) had elapsed, the Heat of the water in the middle 

 of the jar was found to be as follows : 



At the surface of the ice ..... 40 



1 inch above it ....... 84 



2 inches ........ 115 



3 inches ... ..... 116 



7 inches . . . . . . . nj 



When 2 hours had elapsed, the Heat in the middle of 

 the jar was found to be as follows : 



At the surface of the ice . 40 <> 



1 inch above it 7 g 



2 inches 



94 



3 inces ........ .106 



4 inches . ...... Io8 



6inches ....... io8i 



7 inches ........ io8i- 



An end being now put to the experiment, the hot 

 water was poured off from the ice, and on weighing that 

 which remained, it was found that 5 oz. 6 grains, Troy, 

 (= 2406 grains) of ice had been melted. 



Taking the mean temperature of the water at the end 



