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SECTION XXL 



€onjeclures why fome waters, as dif* 

 tilled, boiled^ and fome other wa- 

 ters, do not promote, but impede 

 the operation of the plants in yield- 

 ing dephlogiflicated air* 



A S I think 1 have proved clear- 

 ly enough that the dephlogiflicated 

 air yielded by plants is air elaborated 

 by a kind of vital motion, carried 

 on in the fubftance of the leaves, 

 and kept up by the influence of the 

 light of the fun, it feems that no 

 more is required to collecl; this air 

 than to prevent its diffufmg itfelf 

 through the common mafs of the 

 atmofphere. Water feems the moft 

 appropriated body for fuch an in- 

 tention, for it is not hurtful to plants. 

 G 2 Many 



