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cated to it, by computing the degree 

 of fuperior goodnefs the air is found 

 to pofTefs. 



As plants yield in a few hours 

 fuch a confiderable quantity of de- 

 phlogifticated air, though their 

 iituation feems rather unfavoura- 

 ble for it wheli they are kept 

 under water ; may it not with 

 fome degree of probability be con- 

 jectured, that they yield much more 

 cf it when remaining in ther natu- 

 ral iituation; for then, being conti- 

 nually fupplied by new common air, 

 their flock of dephlogiiticated air 

 cannot be exhausted. It is an un- 

 favourable circurnilance, that air is 

 not an object of our fight; if it was, 

 we mould perhaps fee that plants 

 have a kind of refpiration as animals 

 have; that leaves are the organs of 

 it; that, perhaps, they have pores 

 i which 



