1^6 Anahjfis of the Air. 
contributes to the briskncfs of that and ma- 
ny other mineral waters. I found thefc 
feveral quantities of air, by inverting the 
nofes of bottles, full of thcfe feveral liquors, 
into fmall glafs ciftcrns full of the fame 
liquor. And then fetting them all together 
in a boyler, where having an equal heat, 
the air was thereby feparated and afcended 
to the upper parts of the bottles. 
Experiment LXVII. 
By the fame means alfo, 1 found plenty 
of air might be obtained from minerals. 
Half a cubick inch, '^158 grains of New- 
cajile coaly yielded 180 cubick inches of air, 
which arofc very faft from the coal, efpe- 
cially when the yellowifh fumes afcended. 
The weight of this air is 5 1 grains, which\ 
is nearly f of the weight of the coals* 
Experiment LXVIII* 
A cubick inch of frefh dug untried 
earth off the common, being well burnt 
in diftillation, produced 43 cubick inches of 
air. From chalk alfo, I obtained air in the 
fame manner. 
I E X- 
