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Antilyfis of the Air, 193 



Calculus, fhould rather encourage than dif- 

 courage us, in fcarching after fornc proper 

 difiblvcnt of the Stone in the Bladder, which, 

 upon the analyfis of it, is found to be well 

 ftored with active principles, fuch as are 

 the principal agents in fermentation. For 

 Mr. Boyle found therein a good quantity of 

 volatile fait, with fome oil, and wc fee by 

 theprefent Experiment, that there is ftorc of 

 unelaftick air particles in it. The difficulty 

 feems chiefly to lay, in the over proportion 

 of thefe laft mentioned particles, which are 

 firmly united together by fulphur and fait, 

 the proportion of caput mortuum, or earth 

 being very fmall. 



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Experiment LXXVUI. 



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One eighth of a cubick inch of Mercury 

 made a very infcnfible expanfion in diftilla- 

 tion, notwithstanding 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 

 *hook the retort and receiver. There was 

 no air generated, nor was there any expan- 

 sion of air in the following Exper. m. 



O Expe- 





