in Fluids. 



303 



the manner in which the ice was always found to have 

 been melted, but also from the results of similar experi- 

 ments made with much colder water. 



Had it been melted by Heat communicated by the 

 glass, it would undoubtedly have bpen most melted in 

 those parts of its surface where it was in contact with the 

 glass ; but this I never once found to be the case. 



The results of the following experiments will shew — 

 what indeed might easily have been foreseen — that the 

 temperature of the medium by which the upper part of 

 the jar was surrounded does not always affect the result 

 of the experiment in the same degree, nor even always 

 in the same manner^ in different experiments in which the 

 temperature of the water ip the jar is very different. 



To facilitate the comparison of these experiments, and 

 that of the foregoing, which are similar to them, I shall 

 here place them together. 



It is certainly very remarkable indeed that so much 

 more ice should be melted by water at the temperature 

 of 41°, when the jar which contained it was surrounded 

 by a cold mixture of pounded ice and water, than by an 

 equal quantity of boiling-hot water in the same circum- 

 stances. In the experiment No. 50, the quantity melted 

 by the cold water was 542 grains, while that melted by 



