I 207 ] 



SECTION VI. 



Experiments' tending to invejltgate 

 to what degree plants may affecl 

 common air in the nighty and by 

 day time in Jhaded places* 



39. SOME plants of grafs, with 

 roots and all, were put in a jar of 

 a gallon ; the jar was inverted upon 

 a difh, and fome water put in the 

 difh to keep the plants alive, and 

 to cut off the communication with 

 the external air ; in the morning 

 the air in the jar was altered for the 

 worfe, the flame of a wax-taper 

 grew dim in it. One meafure of 

 it with one of nitrous air occupied 

 1.24, 



5 40. Two 



