[ 54 -] 

 almoft inoffenhve in this rcfpect, 

 which I was the lefs furprized at, as 

 their fubftance is but little different 

 from the ftalks. The roots of a muf- 

 tard plant gave in the fun-mine a 

 good deal of air, when kept under 

 water ; which air was worfe than com- 

 mon air, and extinguished a candle. 

 Thefe roots even corrupted good air 

 in the middle of the fun-fhine. 



A plant, with roots and all, placed 

 in ajar full of water, did, however, 

 yield dephlogifticated air; fo that 

 the bad effect of the roots was over- 

 balanced by the plant itfelf. 



SEC- 



