the dephlogiflicated air, being hea? 

 vier than common air, is rather to? 

 clined to fettle on the furface of the 

 earth among the animal creation. 



But, as animals fpoil equally as 

 much air in the winter as in the 

 fummer by the act of refpiration, it 

 might feem fomewhat furprizing, 

 that this great laboratory ceafes in- 

 tirely by the decay of the leaves. 

 Is this defect fupplied by fome 

 pther means equally powerful? 

 Though we are very far from being 

 able to trace all the active caufes 

 which contribute their mare in 

 Keeping up the wholefomenefs of 

 pur atmofphere, yet we have already 

 traced fome of them, and there- 

 fore muft not defpair of difcover- 

 ing fome more. The making of foul 

 air in water will in great meafure 

 correct it. \Y ater itfelf has a power 



