Analyfis of the Air. 
increafed in weight fix grains in 3 minutes; 
but they made no increafe in weight in the 
fame time, when in the open air: which 
fix grains in 3 minutes, is at the rate of a- 
bout 6 -f- 4 ounces in 24. hours 5 and this 
is nearly the fame proportion of moifture 
that I obtained by breathing into a large 
receiver full of fpunges. But the 6 grains 
imbibed by the four "Diaphragms in 3 mi- 
nutes, was not near all the vapours which 
were in that bulk of inclofed air j for at 
the end of the 3 minutes, the often refpi- 
red air was fo loaded with vapours, which 
in that floating ftate were eafily, by their 
mutual attra&ion, formed into combinati- 
ons of particles, too grofs to enter the mi- 
nute vefictes of the lungs, and was therefore 
unfit for refpiration ? fo that it is not eafy 
to determine what proportion is carried off 
by refpiration, efpecially confidering that 
fome of the infpired air, which has loft its 
elafticity in the lungs, is mingled with it. 
But fuppofing 6 -j-x ounces to be the quan- 
tity of moifture carried off by refpiration 
in 24 hours, then the furface of the lungs 
being found as above 41635 fquare inches 
only TT Vr part of an inch depth, will be 
evaporated off their inward furface in that 
time. 
