C 203 ] 



mine in a fair warm day, from 

 eleven till five o'clock, when they 

 had yielded about one ounce-mea- 

 fure of good dephlogifticated air. 



SECTION V. 



Experiments tending to invejligate 

 the quality of air yielded by plants 

 in the nighty and by day in dark 

 or Jhaded places, 



36. TWO handfuls of grafs, the 

 roots being cut off, were put in an 

 inverted jar of a gallon, full of 

 pump-water, and placed in a room 

 during the night, the jar being 

 covered fo that no light could come 

 at it before I examined it. In the 



morning 



