[ 92 ] 
always kept full of water for the 
horfes. I put a good deal of this 
fubftance in a jar holding a gallon 
of pump-water, and inverted it in 
an earthen pan. In a week’s time 
I found about £4 pint of very fine 
dephlogifticated air collected in the 
jar, which furpaffed in purity the 
air obtained in another jar from the 
green matter -generated by itfelf, 
See experiment roo. 
SEC: 
