SULPHURIC ACID AND WATER. 279 
By comparing together the two specific gra- 
vity columns, in this corrected table, we perceive 
that condensation is the consequence of dilution 
throughout the whole range, and that expansion 
is in no instance apparent. The old and gene- 
rally received notion, consequently, being 
correct. 
Having finished his remarks respecting spe- 
cific gravities, he next proceeds to show the 
quantity of heat evolved when an atom of oil of 
vitriol is mixed with from one to nine atoms of 
water; which he determined by pouring 1000 
grains of oil of vitriol, sp. gr. 1.8422, upon the 
requisite quantity of water, in a glass cylinder 
containing the water, and stirring the mixture 
with a thermometer. The thermometer rose 
with very great rapidity, and began almost im- 
mediately to descend, so that it was difficult to 
notice the highest point to which it rose. He 
gives the following table as showing the results 
of his experiments : 
