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44 that grow near houfes, which has accompanied 
44 our late improvements in gardening, from an 
44 opinion of their being unwholefome. I am cer- 
44 tain, from long obfervation, that there is no- 
44 thing unhealthy in the air of woods ; for we 
44 Americans have every where our country habi- 
44 tations in the midfl of woods, and no people on 
44 earth enjoy better health, or are more prolific.” 
Having rendered inflammable air perfeClly in- 
noxious by continued agitation in a trough of water, 
deprived of its air, I concluded that other kinds of 
noxious air might be reflored by the fame means ; 
and I prelently 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 reflore any kind of noxious air on 
which I have tried it, viz. air injured by re fpi ra- 
tion or putrefaction, air infeCled 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 efteCt 
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 fairell 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 
