444 ]\Ir. G. Gore on the Properties of 



a good bright deposit with the first-named solution ; and from 

 0"25 to 2'25 grains per square inch per hour has often given a 

 good crystalHne deposit with the second liquid. By keeping 

 the cathodes in constant motion, much more rapid action may 

 be successfully ventured. 



8. By similar means to those described, and without the aid 

 of motion, a solid bar of dark bright antimony, upwards of 

 1 inch in diameter and 3 inches long, was formed upon a piece 

 of copper wire jijth of an inch thick and 2 inches long, in a 

 period of twenty-eight days, and with the aid of motion in about 

 half that time. 



9. In depositing antimony from these solutions, a variety of 

 circumstances occui', a knowledge of which will greatly assist in 

 obtaining perfect specimens of the two varieties. In using the 

 ordinary chloride, after the process has been progi-essing one or 

 two days with continuous bright deposit, warty excrescences of 

 the gray variety will nearly always occur upon portions of the 

 receiving surface, the localities of their appearance differing 

 according to the shape of the cathode and its depth of immersion: 

 if it be within half an inch of the surface of the liquid, rough 

 gray metal will appear upon its upper parts. The presence of 

 these excrescences appears in nearly all cases to depend upon 

 accumulations of partly exhausted solution at the upper part of 

 the liquid, and at different parts of the receiving surface. The 

 solution, partly deprived of its metal by the action, and thus 

 rendered specifically lighter, ascends in a layer against the 

 cathode, and accumulates at its over-hanging parts and at the 

 surface of the liquid, and yields in those exhausted or acid por- 

 tions only the gray deposit ; similar effects, but in a much less 

 degree, occur in the solution of chloride of antimony and tartar- 

 emetic. To obviate these effects, the solution should be fre- 

 quently stirred; and to entirely prevent them, the cathode should 

 be immersed at least 1 inch below the surface of the liquid, and 

 be kept in a constant state of gentle swinging motion by attach- 

 ment to the moving pallets of an ordinary clock. Roughness or 

 want of cleanliness of the receiving surface also seems to favour 

 the production of these excrescences. 



10. On every occasion with the first liquid, when the battery 

 power became nearly exhausted, gray nodules appeared; and when 

 once commenced, thore was a strong tendency in them to con- 

 tinue ; but by increased electric power, stirring the liquid, and 

 persistent action, they become covered with amorphous deposit. 



11. If during the process of deposition the temperature of the 

 first solution was gradually raised, the deposited metal suddenly 

 changed from amorphous to crystalline at about 205° Fahr., and 

 less suddenly resumed its amorphous character on cooling, at 



