| [ 46 ] 
ing a plant a long while in pump 
water, the green matter, of which 
Dr. Prieftley found to iffue very 
fine dephlogifticated air, will be 
generated; and thus the air within 
the phial, being mixed with this 
good air, will not. in reality indi- 
ate the effect of the plant upon 
this air, a8 Dr. Prieftley makes no 
fcruple to acknowledge in his late 
work, p. 338. 
S EC 
