[ 33 ° ] 
water, and thence by calculation conftrudted his 
table. 
Experiment IV. 
Having always remarked that the water in the 
neck of the matrafs was elevated higher upon the 
hril immerfion of the fait, than after it was wholly 
diflolved, I endeavoured to afcertain the difference 
in feveral kinds of fait. To do this with the greater 
exadtnefs, I pitched upon a matrafs which had a neck 
as far as 1 wanted it accurately cylindrical, as I found 
by obferving the elevations occalioned by the addi- 
tions of equal portions of water ; the matrafs held 
about 67 ounces of water. The falts I ufed were 
all dry, and in as large pieces as the neck of the ma- 
trafs would admits the water was heated to the forty 
fecond degree of Fahrenheit’s thermometer, and kept 
as nearly as could be in that temperature. I changed 
the water for each experiment, and ufed in each 24 
penny weights of fait s the heights to which the 
water rofe, as meafured from a mark in the middle 
of the tube, before and after the folution of each 
fait are expreffed in the following table : the firft co- 
lumn denotes the height to which the water was 
elevated by 24 penny weights of fait before its folu- 
tion, the fecond after its folution, the third the dif- 
ference in fractional parts of the elevation before fo- 
lution 
Elevation by 24 penny weights 
of fimple water o 58 
24 penny weights of genuine 
Glaubers fait 42 36 4 
1 ' Vol. 
