Mr. Graham on the Heat disengaged in Combinations. 347 
This salt was made anhydrous by a heat little short of red- 
ness, without being fused. Half an equivalent, 52°39 grains, 
was dissolved in 1000 grains of water with a rise of tempera- 
ture of 0°-83 and 0°87 in two experiments, of which the mean 
is085. The rise for a whole equivalent, 104°77 grains of the 
salt, is therefore 1°70. 
Rise on solution of ZnO, SO,+KO,SO, . . . 170 
Fall on solution of ZnO, SO,+KO,SO;,+6HO. 2°60 
Whole heat disengaged in the hydration of a hiah inadsote itn 
FEO, Ss On OU, SO, ee ee 
8. Sulphate of Copper and Ammonia.—Of the crystallized 
salt, 62°45 grains, or one half of the equivalent quantity, were 
dissolved in 983 grains of water with a fall of temperature of 
1°33 and 1°28 in two experiments ; giving 2°63 for the whole 
equivalent. 
Fall on solution of CuO, SO,+ NH,0O, SO,+6HO.2°63. 
The fall on the solution of the two immediately preceding 
salts is therefore sensibly the same. 
9. Protosulphate of Iron and Potash.—Of this salt in small 
but well-defined crystals, 67°66 grains, one half of the equiva- 
lent quantity, were dissolved in 983 grains of water with a 
fall, in two experiments, of 1°-25 and 1°22; or for the whole 
equivalent 2°47, 
Fall on solution of Mn O, SO,+K O, S O;+6HO. 2°47, 
10. Sulphate of ine and Ammonia.—Of the crystallized 
salt half an equivalent, 62°64 grains, was dissolved in 983 
grains of water with a fall of 1°37 and 1°36. 
Fall on solution of Zn O, SO, + K O, SO,+6HO..2%73, 
11. Sulphate of Copper and Potash.—The solution of half an 
equivalent of the crystallized salt, 69-07 grains, in 1000 grains 
of water, was attended with a fall in two experiments of 1°54 
and 1°50; or for the whole equivalent of the salt, 138+14 
grains; the fall is 3°-08 and 3°00, of which the mean is 3°04, 
The crystallized salt was made anhydrous by a heat short 
of redness, which had the effect of causing it to frit but did 
not fuse it. The solution of 52:2 grains, half an equivalent, 
in L000 grains of water, was attended by a fall in two experi- 
ments of 1°-01 and 0-96; or for a whole equivalent, 2°-02 and 
1°-92, of which the mean is 1°97, 
Rise on solution of CuO, SO,+KO,SO, . . . 1°97 
Fall on solution of CuO, SO,+ KO, SO,4+6HO. 3°04 
Whole heat disengaged in hydration of 6, 
CuO, S0,+K 0, $0.4 of re oe 
The fal] on the solution of the preceding crystallized double 
2A2 
