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meafures of nitrous air 1.92; 

 A. Fontana's method it gave 1 qo, 

 1.96, 2.95 ; and thus it did appear 

 by thefe trials to furpafs far in good- 

 nefs the common air ; and yet it 

 exploded at the flame of a candle 

 with an uncommon loud report. 

 See experiments no and in. 



There remained mil one experi- 

 ment to be tried with this air, viz. 

 to put a living animal in it. I was 

 forry to have fpent the mod part 

 of this air, fo as not to have enough 

 of it left for this trial. However, 

 I was refolved to pufti the experi- 

 ment farther, and to let the inflam- 

 mable air itand a longer while up- 

 on the plants, before it was to be 

 employed for the different trials, 

 and principally before an animal 

 ihould be put in it. Some entire 

 plants of perficaria urens were put 

 H 3 in 



