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for one meafure of it with one of 

 nitrous air occupied i .48 ; but it 

 was as inflammable as before. 



It feems to me probable, from 

 the above-mentioned experiments, 

 that plants have a power of cor- 

 recting even the worft of all airs, 

 inflammable air ; but that they re- 

 quire fome days to perform this 

 tranfmutation, and that one and the 

 fame plant does not live long enough 

 in full vigour to finifh the bunefs, 

 if it is fhut up in a narrow fpace 

 with a certain quantity of this air ; 

 and that this air, after having been 

 in a great meafure mended by a 

 plant, returns again to its former 

 poifonous quality, if it remains with 

 the plant after the vital operation 

 of the plant ceafes, which I appre- 

 hend was the caufe of the difference 



of 



