[ 2 4i ] 

 the leaves was taken out of the tarsus 



J City of 



at three in the afternoon. |K££ 



The refult was, that the leaves troyed ' 

 put in pond-water had yielded the 

 leaft quantity of air, and that of no 

 better quality than common air. 

 Thofe in the rain-water had yielded 

 more air, and of a better quality. 

 Thofe in the river- water had yield- 

 ed ftill more and better. The pump- 

 water had yielded the molt arid ben; 

 of all. 



To be able to judge the better 

 of the exact degree of purity of 

 thofe airs, I put them all to the 

 nitrous teft ; the refult was as foK 

 lows : 



Air from the leaves in ftagnating* 

 water 2.04 ; 2.20; 3.22. 178 



Air from the leaves in rain-wa- 

 ter 1.94 ; 1.96^; 2.69; 3.69. 231 

 R Air 



