178 Anahfis of the Air. 



all being diftillcd over, the remaining fcoria 

 did not run per deliqimrn. I cleared the 

 gun-barrel of thefe and the like fcoria, by 

 ftriking long on the outftde with a hammer. 



Experiment LXXIL 



From 2 r i grains or half a cubick inch 

 of Nitre \ mixed with calx of bones, there 

 arofe 90 cubick inches of air, i. e. a quan- 

 tity equal to 1 80 times its bulk $fo the weight 

 of air in any quantity of nitre is about | part. 

 Vitriol diftiiled in the fame manner yields 

 air too. 



Experiment LXXIII. 



Irom a cubick inch or 443 grains of 

 Renijh Tartar, there arofeveryfaft 504 cu- 

 bick inches of air $ fo the weight of the air 

 in this Tartar was 144 grains, /. e. f part 

 of the weight of the whole: The re- 

 maining fcoria which was very little, run 

 per deliquium, an argument that there re- 

 mained fome Sal Tartar, and confequently 

 more air; for 



Experiment LXXIV, 



Haifa cubick inch or 304 grains of Sal 



Tartar, 



