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This abforption alfo takes place 

 in the day time ; but as the plants 

 at that time yield themfelves a great 

 quantity of air, the abforption is 

 not fo eafily afcertained. 



SECTION XX. 



On the beft manner of judging whe- 

 ther the plants are ready to yield 

 their depblogifticated air. 



AS the light of the fun, and not 

 the warmth, is the chief caufe, if 

 not the only one, which makes the 

 plants yield their dephlogilticated 

 air, it feems reafonable to think, 

 that in a bright fun-lhiny morning 



the 



