1862.] 185 



XVIII. " On the Properties of Electro-deposited Antimony " 

 (concluded). By GEORGE GORE, Esq. Communicated by 

 Professor STOKES, Sec. R.S. Received May 24, 1862. 



(Abstract.) 



In tbis communication the author has described two additional 

 kinds of electro-deposited antimony possessing the property of evol- 

 ving heat ; one of them is obtained from a solution of bromide, and 

 the other from a solution of iodide of antimony ; there is also given 

 additional information respecting the peculiar heating-antimony ob- 

 tained from the aqueous terchloride. 



The following is a brief statement and comparison of some of the 

 properties of the three kinds of thermically active antimony. The 

 specific gravity of the chloride deposit is 5*8, the bromide one 5*44, 

 and the one from the iodide 5 '25. The amount of heat evolved is 

 greatest with the one from the chloride solution, and least with that 

 from the iodide ; the former evolves all its heat at 60 Fahr., by 

 contact with a red-hot wire, the bromide one at 280 Fahr., whilst 

 the iodide one requires a temperature of 340 Fahr. ; the latter also 

 acquires a reddish -brown colour by exposure to solar light. 



The chloride deposit contains about 6'3 per cent, of saline matter, 

 the bromide one about 20, and the one from the iodide liquid about 

 22*2. The quantities deposited by a single equivalent of zinc were 

 about 42*5 in the chloride, 50 in the bromide, and 51 in the iodide 

 solution. 



The explanation proposed of their formation is, that the antimony 

 hi depositing, being in the " nascent " state, combines chemically in 

 a feeble manner with the saline ingredients of the electrolyte ; but 

 the complete sources of the evolved heat remain undecided. 



XIX. " On the Sulphur-Compounds in Purified Coal-Gas, and 

 on Crystallized Hydrosulphocarbonate of Lime/' By the 

 Rev. W. R. BOWDITCH, B.A., F.C.S., Wakefield. Commu- 

 nicated by Professor WILLIAM THOMSON, M.A. Received 

 June 14, 1862. 



The following facts relative to sulphur in what is called purified 

 coal-gas, are additional to those already submitted to the Royal So- 

 ciety. 



