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obtained, in which a candle could® 
tity of 
not burn. the two 
43. One handful of roots oftoeye+ 
mufttard plants, cleanly wafhed, was 
put in a quart jar full of water, and 
three ounce-meafures of common 
air let up: after fix hours ftanding 
in the fun, the air was found 
changed for the worfe, for its teft 
was, by Abbe Fontana’s method, 
¥-955 2- 34 3 3:37> 
74 A handtul of roots ats Beca- 
bunga was expofed to in 
quart jar filled with water er 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 airy and fpoiled ordi- 
nary air at all times, 
