APPENDIX. 327 
found that after having breathed fifty times 
through them, the Afhes had increafed in 
Weight feventeen Grains. The Air which 
I there infpired was very dry, for there were 
conftanc Fires in the room 5 fo that the in- 
creafe of Weight which the Afhes acquired, 
muft come from the Moifture carried off 
from my Lungs. And this may be taken 
to be nearly the Quantity of Moifture with 
which the abovementioned five hundred and 
twenty two cubic Inches of Air were im- 
pregnated, when it became unfit for Refpi- 
ration 5 for we breathe fifty times in two and 
a half Minutes. Now a cubic Inch of Wa- 
ter weighing two hundred and fifty four 
Grains, the five hundred and twenty two 
cubic Inches will weigh 132588 Grains, 
whence the like bulk of Air, wdiich is eight 
hundred times lighter, will weigh j 
Grains, of which the abovementioned feven- 
teen Grains of Moifture is but ^th Part. 
Now this Proportion of additional Moifture 
in the Air, does not feem alone fufficient to 
difqualify it for Refpiration : For the com- 
mon Air has frequently a greater Proportion 
of Moifture in it, viz. a (iXiantity equal to 
the one thirds and fomecimes to one half of 
^ • - Y 4 the 
