[ iop 3 



a large pan of hot water, clofe to each other, and near the centre 

 of the pan, the water rifing to the height of the ice in the tum- 

 blers; after a few minutes the ice was thrown out, by inverting 

 the glaffes on clean paper. The two pieces of ice were equal 

 in fize, figure, and weight ; the weight of each being five ounces 

 averdupoife. 



" The moment before the ice was taken out of the tumblers, 

 rfound the temperature of the fea and frefh water, placed as 

 above-mentioned, to be equal, and exactly thirty-four ; the tem- 

 perature of the air in that part of the room being forty-fix. I 

 plunged the pieces of ice immediately, one in the fea-water, the 

 other in the frefh water. It was at this inftant two o'clock in 

 the afternoon. In ten minutes the temperature of the fea-water 

 was thirty-two, that of the frefh water was thirty-three and a 

 half. In half an hour the fea-water raifed the mercury to thirty- 

 three, the frefh water raifed it to thirty- four and a half. 



" At this inftant, viz. half an hour paft two o'clock, I took 

 both the pieces of ice at the fame time, weighed them brifkly, 

 and replaced them in their refpe&ive veflels at the fame inftant. 

 Of the ice placed in the fea-water, half an ounce was diflblved ; 

 of the ice placed in the frefh water, only four drachms and a 

 half were diflblved. 



" From half an hour paft two o'clock until fix I frequently 

 changed the pofition of the tumblers, making one take the place 

 of the other. At fix, the temperature of the fea-water was 

 thirty-fix, that of the frefh water was thirty- feven and a half. 

 In the manner already mentioned, the ice was at this time 

 weighed and replaced. Of the ice in fea-water three ounces and 

 four drachms were difiolved ; of that in frefh water, only two 

 ounces and eight drachms. 



" It 



