374 RELATIVE ATTRACTIONS OF 
the experiments, would admit of. I will, how- 
ever, proceed to give the results of the remainder 
of my experiments, and defer the comparison of 
pressures to a subsequent part of the paper. 
The foregoing experiments were conducted 
generally at temperatures considerably above the 
freezing point of water; but, the frost, at the be- 
ginning of the year 1838, gave me an opportunity 
of experimenting at temperatures ranging about 
that point. 
EXPERIMENTS VII. AND VIII. 
On the 16th January, 1838, 100 grains of sul- 
phurie acid, sp. gr. 1.135, containing 15.8 grains 
of anhydrous acid, were put into a light evapo- 
rating dish of 2% inches in diameter. The dish 
was gently heated upon a sand bath until 663 
grains of water were expelled; the quantity of 
acid and water remaining in the dish being only 
334 grains. The dish with its contents was then 
placed, along with a vessel containing concentra- 
ted acid, under an unexhausted receiver standing 
in a plate of oil, and left in a place of low tem- 
perature. 
Into another evaporating dish of the same size, 
