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experiments no, in. 113, 114, 

 and 1 1 .5 ; and yet I found this very 

 air to explode with fuch a loud re- 

 port, even in a cylindrical jar, that 

 my fervant, who kept the glafs in 

 his hands, thought it was abfolute- 

 ly broken. This event gave me no 

 fmail concern for a method of try- 

 ing the goodnefs of airs, which I 

 had already confidered as infallible. 

 However, I had frill fome hopes left 

 that 1 had committed fome blunder 

 in this experiment ; and very 

 luckily I had frill at hand the 

 jar which contained the perjicaria 

 urens with the inflammable air ; 

 but I was forry to find that my fuf- 

 picion was but too well grounded ; 

 for this air gave, by two different 

 trials, the following remit : one 

 meafure of it with one of nitrous 

 air occupied 0.95 ; and with two 



rneafures 



