Analyjis of the An. \ 6 5 



the other leg of it out of the bolthead ; by 

 which means the water continued up to z, 

 and could not fubfide. Then I placed under 

 che bolthead, while it was in the water, the 

 veffel xx 5 which done, I lifted the veffel x x, 

 with the bolthead in it, out of the water, 

 and tied a waxed thread at z to mark the 

 height of the water : And then approached 

 the retort gradually to the fire, taking care 

 to fcreen the whole bolthead from the heat 

 of the fire. 



The defcent of the water in the bolthead 

 fhewed the fums of the expanfion of the 

 Air in the retort, and of the matter which 

 was diftilling : The expanfion of the Air 

 alone, when the lower part of the retort was 

 beginning to be red hot, was, at a medium, 

 nearly equal to the capacity of the retorts, fo 

 that it then took up a double fpace ; and in 

 a white and almoft melting heat, the Air took 

 up a triple fpace, or fomething more : for 

 which reafon the leaft retorts are beft for 

 thefe Experiments. The expanfion of the 

 diftilling bodies was fometimes very little, 

 and fometime many times greater than that 

 of the Air in the retort, according to their 

 different natures. 



M * When 



