in Fluids. 293 



In the latter of these experiments 3200 grains of ice 

 were melted in 180 minutes, and in the former 914 

 grains were melted in ^'^ minutes. If, therefore, from 

 3200 grains, the quantity melted in 180 minutes, we take 

 the quantity melted in the first 30 minutes, = 914 grains, 

 there will remain 2286 grains for the quantity melted in 

 the succeeding 150 minutes, and this gives 152 grains for 

 the quantity melted in 10 minutes. By the former com- 

 putation it turned out to be 154 grains. 



But if 152 grains of ice is the quantity melted in 10 

 minutes, in the ordinary course of the process three 

 times that quantity, or 456 grains only, could have been 

 melted in this manner in the 30 minutes during which the 

 26th experiment lasted ; and deducting this quantity from 

 914 grains, the quantity actually melted in that experi- 

 ment, the remainder, 458 grains, shews how much must 

 have been melted in pouring the hot water on the ice, 

 or in consequence of the motions into which the water 

 was thrown in the performance of that operation. By 

 the preceding computation this quantity turned out to 

 be 426 grains. 



From the result of these computations I think we 

 may safely conclude that in the ordinary course of the 

 experiments not more than 152 grains of ice were melted 

 by the hot water in 10 minutes. 



■ I shall now proceed to give an account of several ex- 

 periments in which the water employed to melt the ice 

 was at a much lower temperature. 



Having removed a small quantity of ice which re- 

 mained unmelted in the bottom of the jar, I put a fresh 

 quantity of water into it, and placing the jar in a freez- 

 ing mixture, caused this water, which filled the jar to the 

 height of four inches, to freeze into one solid mass ot 



