[ xxviii ] 



After all, he concludes with the 

 following words, p. 310: " When 

 a thefe obfervations are well confi- 

 ci dered, I think it will hardly be 

 doubted but that there is fome- 

 thing in the procefs of vegetation, 

 or at leaft fomething ufually at- 

 tending, it, that tends to meliorate 

 the air, in w r hich it j^ carried on, 

 whatever be the proximate caufe 

 of this effeft, whether it be the 

 plants imbibing the phlogirtic 

 matter, as part of their nourish- 

 ment, or whether the phlogifton 

 unites w r ith the vapour that is 

 continually exhaled from them ; 

 though of the two opinions I 

 u fhould incline to the former." 



Mr. Sheele is fo far from thinking 

 that air is meliorated by plants^ 

 that he even maintains, that vege- 

 tation has the fame effect on air 



that 



