[ 229 ] 



obtained, in which a candle could^ an % 



' tity or 



not burn. thet , w ° 



atrsdel- 



73. One handful of roots of tr °y ed - 

 milliard plants, cleanly warned, was 

 put in a quart jar full of water, and 

 three ounce-meafures of common 



air let up : after fix hours ftan ding- 

 in the fun, the air was found 

 changed for the worfe, for its teft 

 was, by Abbe Fontana's method, 

 1.95 ; 2.34; 3.37. 162 



74. A handful of roots of Beca- 

 hunga was expofed to the fun in a 

 quart jar filled with water during 

 fix hours ; a moderate quantity of 

 air was obtained, which, by the ni- 

 trous teft, proved to be as good as 

 common air. 



All other roots which I tried 

 yielded bad air, and fpoiled ordi- 

 nary air at all times, 



- Q 3 SEC- 



