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i; that grow near houfes, which hits accompanied 

 4i our late improvements in gardening, from an 

 " opinion of their being unwholefome. I am cer- 

 " tain, from long obfervation, that there is no- 

 ii thing unhealthy in the air of woods; for we 

 *' Americans have every where our country habi- 

 " tations in the midfi. of woods, and no people on 

 * 6 earth enjoy better health, or are more prolific." 



Having rendered inflammable air perfectly in- 

 noxious by continued agitation in a trough of water, 

 deprived of its air, I concluded that other kinds of 

 noxious air might be reftored by the fame means 5 

 and I prefently found that this was the cafe with 

 putrid air, even of more than a year's {landing. I 

 fhall obferve once for all, that this procefs has ne- 

 ver failed to reftore any kind of noxious air on 

 which I have tried it, viz. air injured by refpi ra- 

 tion or putrefaction, air infected with the fumes 

 of burning charcoal, and of calcined metals, air 

 in which a mixture of iron filings and brimftone, 

 or that in which paint made of white lead and oil 

 has flood, or air which has been diminifhed by a 

 mixture of nitrous air. Of the remarkable efFect 

 which this procefs has on nitrous air itfelf, an ac- 

 count will be given in its proper place. 



If this procefs be made in water deprived of air, 

 either by the air pump, by boiling, by diflillation, 

 or if frefh rain water be ufed, the air will always 

 be diminifhed by the agitation ; and this is cer- 

 tainly the faireft method of making the experi- 

 ment. If the water be frefh pump water, there 

 will always be an increafe of the air by agitation, 

 the air contained in the water being fet loofe, and 



joining 



