SULPHURIC ACID AND WATER. 275 
The Doctor, after telling us that the acid he 
made use of was pure, except that it contained 
saszth part of its weight of sulphate of lime, 
that it was a compound of 
one atom acid 5 
one atom water 1.125 
its atomic weight being 6.125 
and that its specific gravity was 1.8422, 
commences relating his experiments; and first 
alludes to the specific gravities of different atomic 
compounds of sulphuric acid and water, ob- 
tained by mixing determinate weights of the acid 
and water, and compares their results with the 
results which he obtained by calculating what 
the specific gravities ought to be supposing the 
bulk of the compound to be exactly the same as 
the sum of the volumes of the acid and water 
of which it was formed, or supposing neither 
condensation nor expansion to be consequent 
upon the combination. 
He observes that the conclusion to be arrived 
at from this comparison of his calculation results 
with his experimental results, is, that the com- 
