808 ME. Gr. GrOEE ON THE PEOPEETIES OF ELECTEO-DEPOSITED ANTBIOZST. 
89. In addition to the liquid aheady mentioned (2.) for obtaining gi-ey crystalline 
antimony, the grey metal may be readily obtained by partly saturating hydrofluoric 
acid with tartar-emetic or oxide of antimony, and acting upon the bquid in Ae usual 
manner. Also by placing fragments of antimony Tsith 2^ parts of bydi'ofluonc acid m 
a gutta-percha cup, and adding to them in small portions at a time about one part of 
nitric acid; and when the metal has ceased to dissolve, electrolysing the solution by a 
battery of moderate power. Each of these liquids yields crystalline antimony freely, 
but in neither instance has the metal the peculiar heating property. 
90. The best liquid I have yet found for forming bars, «&c. of the active varieti , is 
composed of one avoirdupois ounce of teroxide of antimony (or of oxychloride of anti- 
mony) dissolved in five or six ounces by measure of pure hydrochloric acid of sp. gr. 1 12. 
Bars are formed by depositing the substance upon narrow strips of sheet silver, the 
edges of which are enclosed by vertical borders of white wax. To remove safely the 
bars from the moulds within which they are deposited, the latter are placed (after being 
well washed with water and the aid of a soft brush) upon a surface of gutta percha m 
ice-cold water, and the walls of wax carefully removed in portions at a time.^ Incon- 
venient projections of the metal are removed by means of a small pair of nippers in 
mimde portions at a time, with the greatest caution, in the cold water. CuUing action 
with this tool is apt to discharge the heat of the metal, whilst slow lever action will 
frequently remove projections one-twelfth of an inch thick mth safetv 
1. Mecaidtulation. 
91. From the experiments and observations recorded in this paper, it appears that 
the heat evolved by electro-deposited antimony is not due to cohesive action (63.), nor 
to alteration of the specific heat of the substance (66.):-™the temperatui’e at which the 
sudden discharge occurs varies from 170° to upwards of 212° Fahk. (69. 70.):— the total 
amount of heat evolved by electro-deposited antimony is usually sufiicient to rarie the 
temperature of an equal weight of ordinary antimony about 660 Fahe. degrees (7o.). 
the evolution of vapour of terchloride of antimony is not a cause but an effect of the heat 
(75 j;. the amount of heat evolved is greater at high temperatui-es than at low ones 
(77.), similar to the specific heat of substances the active substance consists of about 
93-5 per cent, of antimony, 6-0 per cent, of terchloride of antimony, 0-3 per cent, of 
hydrochloric acid, and a trace of water (81.); it is also liable to contain traces of neaih 
all the impurities of the anode and of the depositing liquid (78.):— the discharge of heat 
is always attended by a diminution of attraction between the metal and its associated 
terchloride of antimony (84.):— the terchloride of antimony cannot apparently be ex- 
tracted without destroying the heating property of the substance (85.) . and br lapse 
of time the active substance invariably loses its heating power, especially if it is in a state 
of minute division (87.). 
