i §4 Analyfts of the Air. 
of air in any quantity of nitre is about 4 part 
Vitriol diftillcd in the fame manner yields 
air too* 
Experiment LXXIIL 
Erom a cubick inch, or 443 grains of 
Renijh Tartar , there arofe very faft 504 cu- 
bick inches of air 5 fo the weight of the air 
In this Tartar was 144 grains, /. e. f part of 
the weight of the whole : The remaining 
fcoria, which was very little, run per deli - 
quium y an argument that there remained 
fome Sal Tartar , and confequently more 
air; for 
Experiment LXXIV. 
Half a cubick inch, or 3 04 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 
3 2 grains, is nearly 4 part of the weight of 
the Sal Tartar . There is a more inrenfe 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 
