Anal)Jis of the Air. 1 9 9 



the proportion of caput mortuum, or earth, 

 being very fmall. Vide Vol. II. p. 189. 



Experiment LXXVJII. 



One eighth of a cubick inch of Mercury 

 made a very infenfible 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 fhook the 

 retort and receiver. There was no Air gene- 

 rated, nor was there any expanfion of Air in 

 the following Exper. yig. 



Experiment LXXIX. 



I put into the fame retort half a cubick 

 inch of Mercury, affixing to the retort a very 

 capacious receiver, which had no hole in the 

 bottom. The wide mouth of the receiver 

 Was adapted to the fmall neck of the retort 

 (which was made of a mufket barrel) by means 

 of two large pieces of cork,which entered and 

 filled the mouth of the receiver, they having 

 holes bored in them of a fit fize for the neck 

 of the retort; and the juncture was farther 

 fecured, by a dry fupple bladder tied over it ; 



O 4 for 



