SULPHURIC ACID AND WATER. 287 
consequence of the dilution of oil of vitriol with 
water, will be the same as given by him. And, 
deducting my experimental specific heats froin 
those calculated mean specific heats, we find 
the diminutions of specific heat resulting from 
the mixtures of vil of vitriol and water, thus, 
Mean Sp. heats Diminutions 
Sp. heats. by Expt. of Sp. heat. 
l atom oil of vitriol +1 water, or ¢ 0.4587 —0.4495=0.0092 
1 atom anhydrousacid+2 water. 
latom oil of vitriol +2 water, or 94) ve 
1 atom anhydrous acid +3 water. 0.5312—0.4834— 0.0480 
1 atom oil of vitriol +3 water,or “ re 
1 atom anhydrous acid + 4 water. 0.8969 — 05 164—0.0885 
Latom oil of vitriol +4 water, or f 0.6306 —0.5660=0.0646 
1 atom anhydrous acid + 5 water. 
Dr. Thomson, as before observed, by com- 
paring his experimental specific heats with the 
mean specific heats, finds in the case of 1 atom 
oil of vitriol+1 water an increase instead of a 
diminution of specific heat, and remarks upon 
the impossibility of the heat evolved being a 
consequence of a diminution when no diminu- 
tion takes place; my experiments, on the con- 
trary, however, show, as above, that in the same 
instance there is a diminution, and that it 
amounts to nearly ;;th; in each of the other 
instances they also show a diminution, the 
greatest being in the instance of 1 atom oil of 
