[ 46 ] 



ing a plant a long while in pump 

 water, the green matter, of which 

 Dr. Prieftley found to ifiue very 

 fine dephlogiflicated air, will be 

 generated; and thus the air within 

 the phial, being mixed with this 

 good air, will not in reality indi- 

 cate the effect of the plant upon 

 this air, as Dr. Prieftley makes no 

 fcruple to acknowledge in his late 

 work, p. 338. 



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