26 
DR. ANDREWS ON THE THERMAL CHANGES 
with a solution of the latter previously saturated with ammonia, the thermometer 
rose 1°00. If we assume the heat produced during the decomposition of potash to 
be 0°*99, and subtract from this 0°T8, we shall have for the heat produced by the 
substitution of potash for ammonia 0°*81, which is nearly the same result as before. 
The thermal properties of all the alkaline phosphates and arseniates are very compli- 
cated, and will require further investigation. 
Salts of Manganese. 
Salt. 
Weight. 
Found. 
Ref. to liquid. 
Ref. to water. 
MnO. SO, 
MnO. S0 3 
MnCl.Aq 
MnCl.Aq 
MnO. S.Aq 
18-9 
18*9 
24*9 
24-9- 
30-7 
+ 1-00 
+ 1-00 
+ 1*00 
+ 1-01 
+ 1*11 
4-1-08 
+ 1*08 
-f- 1-08 
+ 1*09 
4-1*19 
+ 1-04 
4-1-04 
4-1-04 
4-1-05 
4-M5 
The composition of the chloride and succinate was determined by converting 
them into sulphates. 17'05 grains of the chloride gave 12-94 grains of sulphate, and 
11*24 grains of succinate gave 6*91 grains of the same, from which the above quan- 
tities were calculated. The succinate, it will be observed, produces a little more 
heat than the other salts. It is probable indeed that all these numbers are rather 
above the truth from the rapidity with which the precipitate absorbs oxygen. This 
produces a slight but distinct evolution of heat for some minutes after the precipita- 
tion takes place. 
Proto-salts of Iron. 
Salt. 
Weight. 
Found. 
Ref. to fluid. 
Ref. to water. 
FeO. SO,.7HO 
FeCl . 4HO 
FeCl . 4HO 
34-5 
24-6 
24-6 
4- 1-52 
+ 1*57 
4-1-53 
4-1-64 
4-1-69 
4-1-65 
4-1-58 
4-1-63 
+1*59 
The same observation applies to these results as to the preceding. 
Salts of Zinc. 
Salt. 
Weight. 
Found. 
Ref. to liquid. 
Ref. to water. 
ZnO . S0 3 
20-06 
4-1*73 
4-1-86 
4- 1*79 
ZnO . S0 3 
20-06 
4-1-76 
4-1-89 
4-1*82 
ZnO .NO, . Aq. 
29-56 
4-1-68 
4-1-81 
+ 1-74 
ZnO.NO,.Aq. 
29-56 
4-1-65 
4-1-78 
4-1-71 
ZnO . NO,. Aq. 
29-56 
4-1-69 
4-1-82 
4-1*76 
ZnCl 
16-87 
4-1-65 
4-1*78 
4-1-71 
ZnCl 
16-87 
4-1-68 
4-1-81 
4-1*74 
ZnCl 
16-87 
+ 1-67 
4-1-80 
4-1-73 
ZnBr 
27-57 
4-1-65 
4-1*78 ' 
4-1-71 
Znl 
39-54 
4-1-68 
4-1-81 
4-1-74 
