2 4^3 Anal^ifis of (be Air. 
cubick inches of air, that will be 48000 ciu 
bid: inches in an hour, at the rate of 20 in- 
Ipirations in a minute. A confiderable part 
of the chhiciry of which air is, we fee 
by the foregoing Experiment, conftantly de- 
tlroycd, and that chiefly among the vefi- 
clcs, where it is charged with much vapour. 
But it is not eafie to determine how much 
is deftroyed. I attempted to find it out by 
the following Experiment, which I fhall here 
give an account of; tho* it did not facceed 
io well as I could have vvifhed, for want of 
much larger vcflels; for if it was repeated 
with more capacious veflels, it would de- 
termine the matter pretty accurately; bccaufe 
by this artifice frefh air is drawn into the 
lungs at every infpiration, as well as in the 
free open air. 
Expert meistt CX. 
1 made ufe of the fyphon (Fig. 39. ) tak- 
ing away the bladders, and diaphragms / i 
n n 0 : 1 fixed by means of a bladder one 
end of a fliort leaden fyphon to the lateral 
foiTet i i : Tiien I faftened the large fyphon 
in a veflli, and filled it with water, till it 
rofe . 
