the water’s finking during the folution, and that this 
air contributes little to the weight of the falts, though 
it may be abfolutely necefiary to the exhibiting the 
faline moleculae under a vifible cryfialline appearance; 
the fecond column will denote the real fpecific gra- 
vities of the falts as freed from air. That this air is 
combined with the falts, and doth not fimply adhere 
to their furfaces, may appear from hence, that the 
fpecific gravities, as calculated from the increafe of 
bulkobferved in the water before folution, fufficiently 
correfpond with thofe which philofophers have deter- 
mined hydroftatically : nor indeed, upon exhaufiing 
the air from the falts, by an air pump, could I obferve 
that it was feparated, in lefs quantity during fo- 
lution. 
Experiment VII. 
Since equal quantities of fait muft contain equal 
quantities of air, it might be expelled a priori , if 
the efcape of the air was the occafion of the water’s 
finking, that equal weights of fait would produce 
equal augmentations of bulk, and unequal weights 
augmentations proportionable to their weights ; but, 
to be affured of this, I took a matrafs containing 
about 30 ounces of water, the tube being cylindrical 
for about 7 inches in length. When the matrafs 
was filled to a proper mark, I put into it 7 penny- 
weights of powdered fai gem.: the water after the 
folution had rifen through 17 tenths of an inch ; by 
the addition of 14 pennyweights more, the water 
was raifed through 5 1 divifions from the firft mark, 
or twice 17 from where it flood after the folution of 
7 penny- 
