4^8 Dr, iNGEN-nousz on the Influence of the 
in an earthen veflel filled with boiled water. I placed this ap- 
paratus near the fire till the water in the bottle began to boil ; 
after which I cooled the whole, and found a good quantity of 
air collected in the bottle, which air proved to be dephlogifU- 
cated. When I drew the vegetable out of the glafs veflel I 
oblerved the water to fparkle almoft like Seltzer water, or 
like water impregnated by art with fixed air. The vegetable 
which was {fill kept in the fecond bottle of exp. I. continued 
to yield aii in the fun-fhme, till it ceafed to throw up any more 
air, towards the feventh or eighth day of its being fhut up 
in the veflels. \\ hen, after this time, this globular veflel was 
fhook, the water became full of fmall air bubbles, which for 
the moft part rofe to the inverted bottom of the veflel, 
great part of them fettling upon the vegetable, which appeared 
all coveied with them. This fparkliug air, which became vilible 
by (haking the glafs, could not but be air originally produced 
by the conferva , and fo loofely joined with the water, that it 
if engaged ltfelf in a great meafure from it by the motion of the 
veflel. After the tenth day the vegetable began to appear 
withered, grew yellow, and began to die. I found about eight 
cubic inches of dephlogifticated air colle&ed in the veflel. This 
proved to be of a very eminent quality, its goodnefs being of 
.352° ; that is to fay, that from a mixture of one meafure ofthis 
air, and as many meafures of nitrous air as were neceflary 
to complete the full faturation, there were deflroyed three mea- 
fures and ^ of a meafure, the tefl being made with Abbe 
font ana’s Eudiometer, employedin the manner defcribed in my 
book upon Vegetables, p. 278. etfeq . The quality of this air was 
Superior to that of any air I ever got from this plant in frefh pump 
water, its goodnefs proving, in general, to be from 260 to 330?, 
in the hot-houfe ; this was during the winter, for I never had 
been 
