[ 259 1 

 nitrous air occupied 0.95 ; and^ an ; f 

 with two meafures of nitrous air* e s ^£ 

 1.92. By Abbe Fontana's method troyed - 

 it gave 1.90; 1.96; 2.95. 205 



Thus this air feemed to furpafs 

 far the goodnefs of common air. 



1 1 1 . I then tried it by the flame 

 of a candle, and found it to ex- 

 plode with a very loud report. As 

 I thought the refult of thefe trials 

 very extraordinary, and to afford a 

 remarkable exception in the appli- > 

 cation of nitrous air to the teft 

 of any air, I repeated each of thefe 

 experiments twice, -and obtained 

 conftantly the fame refult. 



112. I was refolved, however, 

 to repeat again the experiment : 

 Some plants of Perjicaria urens were 

 put in a gallon jar, and a good 

 quantity of pure air was let up in 

 the jar. It was kept in the open 

 air from Sunday till Friday follow- 



S 2 ing, 



