[ 64 J 
air occupied o.95.° The foul ait 
now was not only become as good 
as refpirable air, or air of the at- 
mofphere, but even furpaffed it in 
goodnefs, for one meafure of it with 
one of nitrous air occupied 1.05. 
Now, as the fame plant brought 
the foulairfrom 1.34 to 1.05, and 
the common air from 1.06: to 0.95; 
it appears clear, that the plant had 
corrected the foul air far more than 
it had improved the common air. 
This. experiment was repeated — 
feveral times with nearly = fame 
-refults, | 
“As plants feem to delight in foul 
air, probably becanfe this air im- 
pregnated with phlogifton affords 
more proper nourifhment, v2. 
phlogifton to the plant; it muft of 
courfe happen, that a plant draws 
to it fo much the more phlogifton 
‘ as 
