1 88 Continuation of the Experiments and Obfervations 
Dig. 
r 33 
I 54 
1 66 
I128 
Sp. gravity. 
1,1916 
I,l86o 
1,1820 
1,1631 
Hence Should be added or fubtracled for every 21 0 
above or below 55 0 in order to reduce it to 55 0 , the degree for 
which its proportion of acid and water was calculated. The 
dilatability of this acid is much greater than that of water, 
and even than that of the nitrous acid of the fame denfity. 
I now proceed to examine the quantity of pure acids taken 
tip at the point of faturation by the various fubfbmces they 
unite with. 
OF THE MINERAL ALKALI 
That which I made ufe of was procured from Mr. turner, 
who by a peculiar and ingenious procefs extracts it in the 
greateld purity form common fait. 
Of th is alkali I rendered a portion tolerably cauftic in the 
ufual manner, and evaporating 1 oz. of the cauftic folution 
to perfebt drynefs, I found it to contain 20,25 g r * of lolid 
matter. I was allured, that the watery part alone exhaled 
during the evaporation, as the quantity of fixed air contained 
in it was very fmall, and to dillipate this a much greater heat 
would be requifite than that which I ufed. This dry alkali I 
immediately diflblved in twice its weight of water, and fatu- 
rating it with dilute vitriolic acid, found it to contain 2,2 c 
gr. of fixed air, that being the weight which the faturated fo- 
lution 
