[ m ] 



et It was obferved, during the foregoing and other experi- 

 ments, and it is vifible from the experiments related, that fire, 

 in difFufing itfelf from warm bodies to contiguous cold bodies, 

 proceeds flowly ; that cold bodies do not acquire the temperature 

 of the warmer medium in which they are immerfed fo fbon as 

 is commonly imagined, but, on the contrary, require a conlide- 

 rable time for that purpofe; and this time is directly as the dia- 

 meter of the cold body. 



" It was inferred from thefe experiments, that a temperate body 

 like water, placed in a cold medium, as in air, cooled to thirty 

 or thirty-one of Fahrenheit, requires many hours before it acquires 

 the temperature of the furrounding medium, and before a conge- 

 lation commences; and that the time neceffary for the com- 

 mencement of the congelation is directly as the mafs and fhortefr. 

 diameter of the water, and the progrefs of the congelation is 

 inverfely as the depth of the water. 



" It was alfo obferved, that as much of a given mafs of water 

 was frozen in five hours in a temperature of twelve degrees below 

 the freezing point, as was frozen in one hour in a temperature 

 fifty degrees below the freezing point ; and that long duration of 

 the temperature between twenty and thirty-two is, towards 

 the congelation of ,water, equivalent to interifity of cofd, fucfi 

 as is marked o, and below o, in Fahrenheit, but of fliort dura- 

 tion. 



" It was moreover obferved, that water in thick jars covered 

 was not frozen, when water in open vefTels was frozen; that 

 water included in maffive vefTels of wood, or furrounded by any 

 matter except water, to fome thicknefs, preferved its tempera- 

 ture, and refitted congelation, longer than the like quantity of 

 water expofed to the cold air ; and that water in thick vefleis was 

 not frozen fo Toon. as a like quantity of water in thin vefTels of 

 2 like 



