Analyfis of the Air. t6p 
by drawing the water up under the inverted 
glafs to what height I pleafed by means of 
a fyphon : X meafured the bulk of the fpaces 
zy or z n , by pouring in a known quan- 
tity of water, as in the foregoing Experi- 
ment, and making an allowance for the 
bulk of the neck of the bolthead, within 
the fpace z > /. 
When I would take an eftimate of the 
quantity of Air abforbed and fixed, or ge- 
nerated by a burning candle, burning brim- 
{tone or nitre, or by the breath of a living 
animal, &c. X firft placed a high {land, or 
pedeftai in the veflel full of water x x y 
(Fig. 35.) which pedeftai reached a little 
higher than z z. On this pedeftai X placed 
the candle, or living animal, and then 
whelmed over it the large inverted glafs 
zzaa , which was fufpended by a cord, 
fo as to have its mouth r r three or four in- 
ches under water; then with a fyphon I 
fucked the Air out of the glafs veffel till the 
water rofe to z z. But when any noxious 
thing, as burning brimftone, aquafortis, or 
the like, were placed under the glafs 5 then 
by affixing to the fyphon the nofe of a large 
pair of bellows, whofe wide fucking orifice 
was clofed up, as the bellows were enlarged, 
they 
