[ xxiii J 
to +,dth of the two airs employed 
in the experiment. 
The difcovery of Dr. Prieftley, 
that plants thrive better in foul air 
than in common and in dephlogifti- 
cated air, and. that plants have a 
power of correcting bad air, has 
thrown a new and‘ important light 
upon the arran gement of this world. 
It fhews, even to a demontftration, 
that the vegetable kingdom is fub- 
-fervient to the animal; and, vice 
verfd, that the air, fpoiled and ren- 
dered noxious to-animals by. their 
ning in it, ferves to plants as a 
kind of nourifhment. But in what 
manner this faculty of the plants is 
see remained {till unknown. 
le 
— There was even fome doubt left 
“$n the mind of many philofophers, 
whether the facts related by. Dr. 
Prieftley were not owing to fome 
b 4 | “par- 
