214 Analyfis of the Air\ 
That I might find whether the air was al> 
forbed by the fumes only of the Aqua-regia^ 
or by the acid fulphureous vapours, which 
afeended from the Antimony , I put a like 
quantity of Aqua-regia into a bolthcad by 
(Fig. 34.) and heated it by pouring a large 
quantity of hot water into the ciftern x at, 
which flood in a larger veflel, that retained 
the hot water about it , but no air was ab- 
forbed •, for when all was cold, the water 
flood at the point z, where I firft placed it: 
Yet in the diftillation of compound Aqua- 
fortis, Exper. 75. a little was abforbed. Hence 
therefore it is probable, that the greateft 
part, if not all the air, was abforbed by 
the fumes, which arofe from the Antimony. 
Experiment XCII. 
Some time in February y the weather very 
cold, I poured upon a quarter of a cubick 
inch of powdered Antimony y a cubick inch 
of compound or double Aquafortis in the 
bolthead by (Fig. 34.) in the firft 20 hours 
it generated about 8 cubick inches of air 5 
after that, the weather being fomewhat 
warmer, it fermented fafter, fo as in 2 or 3 
hours 
