2 y 6 Mr . Cavendish’s Experiments , &c. 
the only circumftance to which, at that time, I could attri- 
bute the difference in our refults. And with regard to the 
manner of preparing the dephlogilficated air from the black 
powder, I have mentioned all the particulars in which my 
manner of proceeding differed from Dr. Priestley’s, and 
have alfo explained on what I imagine the fuccefs intirely de- 
pends ; fo that, I believe, no one at all converfant in this kind 
of experiments will think that I did not communicate to him 
my method of procuring that air. 
