362 Dr. Fordyce's Experiments on the Lofs of 



whole, when perfedlly clean, weighed 2150^4. of a grain 

 exa6lly ; the heat being brought to 32 degrees, by placing it In 

 a cooling mixture of lalt and ice till it jufl: began to freeze, and 

 fhaking the whole together. 



After it was weighed it was again put into the freezing mix- 

 ture, and let ftand for about twenty minutes; it was then 

 taken out of the mixture ; part of tlic w^ater was found to be 

 frozen ; and it was carefaily \\iped, tirO; with a dry linen cloth, 

 and afterwards with dry wafiied leather ; and on putting it into 

 the Icale it was found to have gained about the ^l^ part of a grain. 

 This was repeated {i\'Q times : at each time more of the water 

 was frozen, and more weight gained. In the mean time the 

 heat of trie room and apparatus had funk to the freezing 

 point. 



When the whole was frozen, it was carefully wiped and 

 weighed, and found to have gained J-^ of a grain and four di- 

 vifions of the index. Upon ilanding in the fcale for about a 

 minute, 1 found it began' to lofe weight, on which 1 imme- 

 diately took it out, and placed it at a diftance from the beam. 

 I alio immediately plunged a thermometer in the freezing 

 mixture, and found the temperature 10 degrees; and on put- 

 ting the ball of the thermometer in the hollow at the bottom 

 of the glafs Yt&\, it fhewed 1 2 degrees. 1 left the whole for 

 h^lf an hour, and found the therm.ometer, applied to the hol- 

 low of the glafs, at 32°. Every thing now being at the fame 

 temperature, 1 w eighed the glafs containing the ice, after wiping 

 it carefully, and found it had loll: 4 and five divifions ; fo that 

 It weighed _'-y, all but one divifion, more than when the water 

 was fluid. 



I now melted the ice, excepting a very fmall quantity, and 

 left the glafs vcflel expofed to the air in the temperature of 32 



degrees 



