Analy/is of the Atr. \6i 
If 
which was fufpended by a cord, fo as to 
have its mouth r r three or four inches un- 
der/water 5 then with a fyphon 1 fucked 
, the Air out of the glafs vcflel till the water 
rofe to z z. But when any noxious thing, as 
I burning brimftone, aquafortis, or the like> 
1 were placed under the glafs 5 then by affix- 
ing to the fyphon the nofc of a large pair of 
bellows, whofe wide fucking orifice was 
clofed up, as the bellows were enlarged, 
they drew the Air briskly out of the glafs 
zz a a thro' the fyphon; the other leg of 
which fyphon I immediately drew from un- 
der the glafs veffel, marking the height of 
I the water ^ z^ 
jjj When the materials on the pedeftal ge- 
I'i nerated Air, then the water would fubfide 
i from z z to a ay which fpace z z a a was 
equal to the quantity pf Air generated : 
But when the materials deftroyed any parr cf 
the Air's elafticity, then the water would 
rife from a a ( the height that I in that cafe 
I I at firft fucked it to) to and the fpace 
I a a z z was equal to the quantity of Air, 
i l whofe elafticity was deftroyed, 
I fometimes fired the naaterials on the 
'k pedeftal by means of a burning glafs, njiz, ^ 
^ -■ M z fuch 
