184 dnalyjis of the Jtr. 



of air in any quantity of Vitre is about f 

 part. Vitriol diftilled in the fame manner 

 yields air too. 



Experiment LXXIII. 



From a cubick inch, or 443 grains of 

 Renijh Tartar, there arofe very fan: 504 cu- 

 bick inches of air; fo the weight of the air 

 in this Tartar was 144 grains, i. e. -J part of 

 the weight of the whole: The remaining 

 fcoria, which was very little, run per deli- 

 quiuniy an argument that there remained 

 ibme Sal Tartar , and confequently more air. 

 For, 



Experiment LXXIV. 



Half a cubick inch, or 304 grains of Sal 

 Tartar , made with nitre and tartar, and 

 mixed with a double quantity of calx of 

 bones, yielded in diftillation 112 cubick 

 inches of air ; that is, 224 times its bulk 

 of air; which 112 cubick inches weighing 

 32 grains, is nearly -J part of the weight of 

 the Sal Tartar. There is a more intenfe de- 

 gree of heat required to raife the air from 

 Sal Tartar than from nitre. 



Hence we fee, that the proportion of 

 air in equal bulks of Sal Tartar and nitre is 



as 



