of the Air. 
21 % 
getables. However we may with pleafure 
fee what immenfe treafures of this noble 
and important element, endued with a 
mod active principle, the all-wife Providence 
of the great Author of nature has provided § 
the conftant wade of it being abundantly 
fupplied by heat and fermentation from in- 
numerable denfe bodies 5 and that probably 
from many of thofe bodies, which when 
they had their afeendiag fumes confined in 
my Glafles, abforbed more air than they 
generated, but would in a more free, open 
fpace generate more than they abforbed 
I made fome atempts both by fire, and 
alio by fermenting and abforbing mixtures, 
to try if I could deprive all the particles of 
any quantity of elaftick air of their elafticity, 
but I could. not effed it: There is therefore 
no dired proof from any of thefe Experi- 
ments, that all the elaftick air may be ab- 
forbed, tho ? tis very probable it may, fmee 
we find it is in fuch great plenty generated 
and abforbed ; it may well therefore be 
ail abforbed and changed from an ’elaf- 
tick to a fixt ftate : Eor as Sir Isaac New- 
ton ebferves of light, “ that nothing more 
is requifite for producing all the variety of 
[ c colours, and degrees of refrangibility, than 
“ thftfr 
