Analyfis of the Air. zij 
there arofe from a piece of heart of Oak , 
2 1 6 times its bulk of air. Now 2 1 6 cubick 
inches of air, comprefled into the fpace of 
one cubick inch, would, if it continued there 
in an elaftick ftate, prefs againft one fide of 
the cubick inch with an expanfive force 
equal to 3310 pounds weight, fuppofing 
there were no other fubftance but air con- 
tained in it; and it would prefs againft the 
fix fides of the cube, with a force equal to 
19860 pounds, a force fufficient to rend 
the Oak with a vaft explofion : Tis very 
reafonable therefore to conclude, that moft 
of thefe now aftive particles of the new 
generated air were in a fix'd ftate in the Ap- 
ple and Oak before they were roufed, and 
put into an aftive repelling ftate by fermen- 
tation and fire. 
The weight of a cubick inch of Apple 
being 191 grains, the weight of a cubick 
inch of air I- of a grain, 48 times that 
weight of air is nearly equal to the four- 
teenth part of the weight of the Apple. 
And if to the air thus generated from a 
veflel of any vegetable liquor by fermenta- 
tion, we add the air that might afterwards 
be obtained from it by heat or diftillation ; 
and to that alfo the vaft quantity of air 
P 4 which 
