

r». 



•■•■ 



*•' 



d 



Analyfa of the Air. 



which was fufpcnded by a cord, fo as to 

 have its mouth r r three or four inches on- 

 der water ; then with a fyphon I fucked 

 the Air out of the glals vefiel till the water 

 rofc to z z. But when any noxious thing, as 

 burning brimftone, aquafortis, or the like* 

 were placed under the glafs ; then by affix- 

 ing to the fyphon the nofe of a large pairof 

 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 le<* of 

 which fyphon I immediately drew from un- 

 der the glafs vcflel, marking the height of 

 the water z z. 



When the materials on the pedcftal ge- 

 nerated Air, then the water would fubfldc 

 from zz to a a, which fpace z z a a was 

 equal to the quantity of Air generated : 

 But when the materials deftroyed "any part cf 

 the Air's elafticity, then the water' would 

 rife from a a (the height that I in that cafe 

 at firft fucked it to) to z z } and the fpacq 

 aazzwzs equal to the quantity of Air, 

 whofe elafticity was deftroyed. 



I fometimes fired the materials on the 

 pedeftal by means of a burning glafs, viz. 



M 2 fuch 



#1 







