[ III J 



diflqlved, only one drachm remaining; four ounces ten drachms 

 ©f the ice in frefh water were diflblved, only fix drachms re- 

 maining. 



44 At the end of the thirteenth hour, after the immerfion of 

 the mafTes of ice in the frefh and in the falt-water, that is, at 

 three in the morning, the temperature of the room was forty- 

 five near the place where the tumblers flood. The tempe- 

 rature of the open air was thirty-one. The ice in the fea-water 

 was melted. The quantity of ice remaining in the frefh water 

 was one drachm, which, in fifteen minutes more, was entirely 

 melted. 



" At this period, when the ice in the frefh water was melted,, 

 that is, a quarter of an hour pafr. three, the mercury ftood at 

 forty in the frefh water, in the falt-water it ftood at forty- one. 

 In a quarter of an hour after this the mercury ftood at forty-two 

 in the falt-water,, and at forty-one in the frefh water. In a 

 quarter of an hour more, the temperature remained unalterable 

 in the fait and frefh water, although the temperature of the air 

 between and near the veffels was forty-five, and the veffel on the 

 right was placed on the left, and replaced feveral times. And 

 both veflels were at all times equi-diflant from the wainfcot, 

 which was perfectly clofe, as were the boards of the floor alfb* 



44 In a quarter of an hour more, the temperature of the air 

 near and between the tumblers remained forty-five; the tem- 

 perature of the frefh water was fcarcely forty-two; the tem- 

 perature of the falt-water was forty-two and a half. 



44 In a quarter of an hour more, the temperature of the air 

 between the tumblers being forty- four and a half, the tempera- 

 ture of the falt-water was forty-three; the temperature of the 

 frefh water was fomewhat more than forty-two. It was now paft 

 four o'clock in the morning, on Monday the 2 2d of January, 

 I went to bed leaving the tumblers in the pofition defcribed. 



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