f-1 



ML 



[ 219 3 



SECTION VIII. 



xperimentsjbewing that plants have 

 a remarkable power to correct bad 

 air in the day. 



56. A fprig of pepper -mint put9p n ; { 

 in a jar full of air fouled by breath- ^V"? 

 ing (fo as to extinguifh a candle), tr °y ed - 

 and expofed to the fun, had corrected 

 this air in three hours fo far that a 

 candle could burn in it, 



57. A fprig of a nettle was put 

 in a jar full of air fouled by breath- 

 ing fo as to extinguifh a candle ; it 

 was placed in a room during the 

 whole night ; next morning the air 

 was found as bad as before. The 

 jar was put at nine in the morning 

 in the fun-fhine ; in the {pace of 



two 



