Mr. nairne on Ice of Sea Water. 25 r 
In order to afcertain the comparative gravity of this 
water, I filled a bottle with it to a certain mark in its neck, 
which was very narrow, and weighed the bottle fo filled 
very carefully. I weighed the fame bottle, filled to the 
fame mark in its neck with lea-water and other waters 
fucceflively, which were all brought to the fame degree 
of heat by a thermometer. The refults were as follow; 
videlicet , 
Grains. 
Water obtained from the melted ice of the fea 
1 
water, 
Diftilled rain water, 
Water taken out of a water tub, being a mixture 
of rain and fnow water, 
The fea water, 
The refiduum of the fea water from which the 
ice before mentioned had been taken, 
To find the degree of cold in which fea water begins 
to freeze, I made the following experiments. 
I expofed to the open air a decanter filled with the fea 
Water, in which a thermometer was fufpended, the bulb 
of which reached to the middle of the wideft part of the 
decanter; a jelly glafs filled with the fame fea-water, in 
which alfo a thermometer was put, refting on the bot- 
tom, was placed in the fame expofure. The refult will 
be feen in the following table : 
K k 1 
Veffel. 
