Analyfis of the Alr\ 193 



Calculus, fliould rather encourage than dif- 

 couragc us, in fearching after foriie proper 

 diffolvent of the Stone in the Bladder, which, 

 upon the analyfis of it* is found to be well 

 ftored with a&ive principles, fuch as are 

 the principal agents in fermentation. For 

 Mr. Boyle found therein £ good quantity of 

 volatile fait, with fome oil* and we fee by 

 the prefent Experiment, that there is (tore of 

 unelaftick air particles in it. The difficulty 

 feems chiefly to lay, in the over proportion 

 of theft laft mentioned particles, which are 

 firmly united together by fulphur and fal^ 

 the proportion of caput mortuum 7 or earth 

 being very fmalL 



Experiment LXXVIII. 



One eighth of a cubick inch of Mercury 

 made a very infenfiblc expanfion in diftilla- 

 tion, notwithftanding the iron retort had 

 an almoft melting heat given it^ at a fmith's 

 forge, fo that it made an ebullition, which 

 could be heard at fome diftance, and withal 

 fhook the retort and receiver. There was 

 no air generated, nor was there any expan- 

 fion of air in the following Exper. <vi&. 



O Exp e- 



