f-200 J 
ey two hours the air was fo much cor- 
the werected, that it was found to be nearly 
tod as good as common air. 
58. A fprig of Perficaria urens 
was put in a phial full of air fouled 
by breathing, fo as not to allow a 
candle to burn in it; it was expofed 
to the fun during an hour and an 
half, in which time the air was fo 
. much corrected that a candle could 
burn init. “The fame’ effe& was 
obtained from a fprig of a vine, and 
that of-a camomile plant, and from 
fome rufhes. 
59. A mufiard plant was put in 
a jar; the ftem was cut off on‘a level 
with the orifice of the jar; the jar 
“was then inverted i in an earthen pan 
containing’ fome water to keep the 
plant alive, ‘and placed over-night 
in a room; next morning’ the air 
ot the: jar was found much fouled, 
fa 
