804 
ME. G. GOEE OX THE PEOPEETIES OP ELECTEO-DEPOSITED AXTIMOXY. 
The thermic discharge iii this case was rather feeble and slow, and the loss of tnponr 
was 7-79 grains = 3-02 per cent. The amount of heat evolved by the bar was sufficient 
to raise the temperature of its own weight of ordinaiy antimony (of specific heat O-OoOS) 
638-022 Fahe. degrees. 
No. 2. 
Antimony. 245-90 grains (sp. heat=0 06312) = 15-521 grains of water 
Brass basket (sp- beat=0-0939 ) = grains of water 
21-867 grains of water 
Pell from loT'^-lo to 69'-4 
Pahe. = 87-75 degrees. 
Immersed part of glass tube of calorimeter (sp. beat=0-1770)~ 28-718 grs. of water 57C.-5 
Mercury of thermometer (sp.heat=0-033 )= 2-070 grs. of water , 69-4 Pahk. 
Portion of stem of thermometer (sp. heat=0-1770) = 3'600 grs. of water j degrees. 
AYater of calorimeter grs. J 
804-660 grs. of water 
The discharge in this instance was instantaneous and powerful, and the loss of vapour 
was 13-06 grains=5-311 per cent. The amount of heat evolved by the^bar was suffi- 
cient to raise the temperature of its own weight of ordinary antmiony (o -8_ .tHK. 
degrees. It appears from these experiments that the amount of heat evolved by the 
peculiar change of antimony varies with the temperatiue at which the discharge occurs 
and is greater at high temperatures than at low ones, similar to the specific heat of 
substances. These experiments also confirm the previous ones (7o.) with regard to t e 
absence of relation of the amount of evolved heat to that of evolved vapour ; 1 t le 
amount of heat varied with the amount of vapour, it would, 111 the second of t ese 
experiments, have been sufficient to have raised the temperature of the given weight of 
ordinary antimony 1069-64 Fahe. degrees, instead of 732-829 degrees. 
g. Chemical composition of the active substance. 
78. The deposited metal has been repeatedly found by chemical analysis to contain, 
in addition to terchloricle of antimony and hydrochloric acid, small porHons of nearly 
all the impurities which existed in the anode and in the depositing liquid. The sma 
portions of gas and carbon observed in former experiments of fusion (53. 54.), appeared 
to be due to enclosed traces of tartar-emetic decomposed by the heat. 
79 To exclude the possibility of the peculiar property of electro-deposited antiniony 
beino- dependent upon the presence of impurities, I purified antimony and teroxide of 
antimony for the anode and solution by several methods. 1st. Some very pure tartar- 
emetic was projected, in small portions at a time, into a red-hot assay crucible; ^nd the 
resulting mass of antimonide of potassium removed when cool, trhiirated with distilled 
water until all the potash and carbon were removed, and after drying fused with a little 
cyanide of potassium. 2nd. Some of the best quality of commercial antimony was very 
hnely pulverized and boiled with pure sulphuric acid, the cooled ci-ystallme sulphate 
washed first with cold and then with hot distilled water until all traces of iron disap- 
