i xxvii > J 
* acainft a hundred cafes, in which 
« the air is made worfe by it.” 
Soon after, p. 305, he relates 
feveral inftances in which a plant 
had, in the fpace of feven, eight, 
ten, or more days, effectually mend- 
ed the foul air in which it was 
made to grow. P. 309, he relates 
a fact, in which a {prig of winter 
favory, kept growing in a jar from 
the 16th of June to the 20th, had 
improved. the air. evidently, which 
oo eae he found by —— re~ 
oF I. 275 to T. aa, mie Priiles 
another initance, in which air was 
fo much improved by a fprig of 
pariley growing init, from the 16th 
of June to the rift of July, that one 
meaftre of it with one of nitrous 
pied only one meine: _ 
