C 253 ] 



I found the bulk, of air increafed 

 to about ~. One meafure of it 

 with one of nitrous air occupied 

 1.90. 



105. Two ounce-meafures of 

 inflammable air was alfo let up in 

 a fimilar jar with one handful of 

 Perjicaria urens or water-pepper ; 

 next day I found the bulk of the 

 air diminifhed about ^-. One mea- 

 fure of it with one of nitrous air 

 occupied 1.97. 



N. B. All thefe three jars Hood 

 in the houfe from the evening till 

 between twelve and one next day, 

 fo that the light of the day may 

 have extricated fome air from the 

 pepper-mint and the walnut-leaves. 



As neither of thefe plants could 

 be faid to have really corrected this 

 poifonous air, I was curious to fee 



what 



