Formation oj Volatile Alkali. 
j 
«; 
A' 
q, 3 c — * 
+ — ~ ioo 
»3°535 >02013 
2, 85654925-, 30 ^ 5 . v _ 
^ - ' o°’53:> > 
,02613 
,02613*4-2,85654925 - ,30535 * = ,79787955 ; 
,2 7922 # — 2,05866970 
vV = 7,373 the number of grains of 
phlogiflicated air in 100 cubic inches, or in 9,355 grains of 
the mixture; and 9,355 - 7,373 = 1,982, the grains of inflam- 
mable air. 
N° w 7,373 : 1,982 :: 121 : 32 ; the quantity of phlogifli- 
cated air is to that of inflammable, as 121 to 32. 
According to M. Berthollet’s experiments, the quantity 
of phlogiflicated is to that of inflammable air, as 121 : 29. 
This is not very wide of calculation. If we conflder the great 
difficulty of obtaining thefe fpecific gravities with exadtnefs, 
we muft be pleafed to find fo near a concurrence, and place 
more confidence in experiments on the fpecific gravities and 
combinations of aeriform bodies, than has generally been given 
them. M. Berthollet’s experiments come within _L. of 
calculation ; and this difference will be diminifhed by two- 
thirds, if we take the fpecific gravities of the phlogiflicated 
and inflammable airs in the proportion of 11 to 1, as he has 
done, inftead of Mr. Kirwan’s proportion, which I have fol- 
lowed in this calculation. 
Vol, LXXVIII. 
F f f 
