on Refpiration. 109 
9.12 gr. of it muft have entered the blood, which is three 
times as much as that which did not enter, but was employed 
in forming the fixed air in the lungs. 
I breathed in 100 oz. m. of dephlogifticated air, of the 
ftandard of 1.0, till it was reduced to 58 oz. m , and by wafh- 
ing in water to 52 oz. m. of the ftandard of 1.75, with two 
equal quantities of nitrous air. The computations being made 
as before, it will appear, that, before this procefs, this air con- 
tained 66 oz. m. of phlogifticated, and 34 oz. m. of dephlo- 
gifticated air; and that after the procefs there were 30.368 oz. 
m. of phlogifticated air, and 21.632 oz. m. of dephlogifticated 
air. In this cafe, therefore, the dephlogifticated air that difap- 
peared was 13.3 oz. m. weighing 7.8 gr. and the fixed air was 
6 oz. m. weighing 4.4 gr. ; fo that here alfo about three time« 
as much entered the blood as did not. 
Thefe experiments I repeated many times, and though not 
with the fame, yet always with fimilar, refults, the greateft 
part of the dephlogifticated air, but never the whole, pafting 
the membrane of the lungs, and entering the blood. 
When the refults above mentioned are compared, it will ap- 
pear, though the obfervation efcaped Dr. Goodwyn, that part 
of the phlogifticated air entered the blood, as well as the de- 
phlogifticated air ; or, which is the fame thing, that the de- 
phlogifticated air which was con fume cl was not of the pureft 
kind. This experiment I repeated fo often, and always with 
the fame refult, that I am confident I cannot be miftaken in 
th is conclufion. This fa£t, of which I had no previous expec- 
tation, I firft thought might be accounted for by fuppofing, 
that the two conftituent parts of atmofpherical air, viz. the 
phlogifticated and dephlogifticated air, are not fo loofely mixed 
as has been imagined ; but rather that they have feme principle 
