in Fluids. 



291 



On the surface of this ice-cold water, instead of that 

 of the ice, I now placed the perforated wooden dish, 

 previously made ice-cold, and poured the hot water 

 upon it. 



The results of the following experiments show that 

 this contrivance tended much to diminish the apparent 

 irregularities of the experiments. 



The air of the room in which these experiments were 

 made was of the temperature of 41°. 



From the results of these last three experiments we 

 can now determine with a very considerable degree of 

 certainty how much ice was melted in the act of pouring 

 the water into the jar ^ and consequently the rate at which 

 it was melted in the ordinary course of the experiment, 

 — supposing equal quantities to be melted in equal 

 times. 



As in the 27th experiment 3200 grains were melted in 

 180 minutes, and in the 25th experiment 580 grains were 

 melted in 10 minutes, we may safely conclude that the 

 same quantity must have been melted in the same time 

 (10 minutes) in the 27th experiment; if, therefore, from 

 3200 grains — the quantity melted in 180 minutes in this 

 last experiment — we deduct 580 grains for the quantity 

 melted during the first 10 minutes, there will remain 

 2620 grains for the quantity melted in the succeeding 

 170 minutes, when, the motions occasioned in the water 



