362 j Dr. Fordyce’s Experiments on the Lofs of 
whole, when perfectly clean, weighed 2150*4. of a grtifi 
exactly ; the heat being brought to 32 degrees, by placing it in' 
a cooling mixture of fait and ice till it juft began to freeze, and 
ftiaking the whole together. 
After it was weighed it was again put into the freezing mix- 
ture, and let ft and for about twenty minutes; it Was then 
taken out of the mixture ; part of the water was found to be 
frozen ; and it was carefully wiped, fir ft with a dry linen cloth, 
and afterwards with dry walked leather ; and on putting it into 
the icale it was found to have gained about the part of a grain. 
This was repeated five times : at each time more of the water 
was frozen, and more weight gained. I11 the mean time the 
heat of the room and apparatus had funk to the freezing 
point. 
When the whole wus frozen, it was carefully wiped aiid 
weighed, and found to have gained of a grain and four di- 
vifions of the index. Upon Handing in the fcale for about a 
minute, 1 found it began to lofe weight, on which I imme- 
diately took it out, and placed it at a diftance from the beam. 
I alfo imdiediately 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 veftel, it fhewed 1 2 degrees. I left the whole for 
half an hour, and found the thermometer, applied to the hoU 
low of the glafs, at 32 0 . Every thing now being at the fame 
temperature, I weighed the glafs containing the ice, after wiping 
it carefully, and found it had loft 4- and five divifions ; fo that 
it Weighed all but one divifion, more than when the water 
wasfluid. 
I now melted the ice, excepting £ very fmall quantity, and 
left the glafs veftel expofed to the air in the temperature of 32 
