C 257 ] 



the jar in the fun-fhine from twelve 

 till five o'clock, I found the air 

 much corrected, for one meafure 

 of it with one of nitrous air occu- 

 pied 1.30. The air was very ex- 

 ploitive. 



I was now fatisfied that all plants 

 poilefs the power of correcting in* 

 flammable air ; but I wanted to fee 

 # whether plants could reduce inflam- 

 mable air to the purity of common 

 air, by letting the inflammable air 

 remain during two or more days 

 with the plant. 



no. A meafure of inflammable 

 air was let up in a jar containing 

 a handful of Perjicaria urens, and 

 another meafure in a jar contain- 

 ing a handful of leaves of a wal- 

 nut-tree. They flood 48 hours in 

 the open air, when I examined 

 them. 



S The 



