454 Mr. G. Gore on the Properties of 



Nos. 3 of gray depositj and 4 of amorphous deposit, were formed 

 by the same current ; and Nos. 4 of gray and 6 of amorplious 

 deposit, were also formed by one current. Nos. 1 of gray, and 

 3 and 7 of amorplious deposit, were formed upon copper-wire 

 helices kept in a state of constant motion, No. 7 being formed 

 by veiy slow action, 



49. In a separate experiment, with a two-pairs battery, the 

 equivalent of crystalline metal obtained was 40' 728, and of 

 amorphous metal 43989; and in a very reliable experiment 

 with a moving helix, the equivalent obtained of amorphous anti- 

 mony was 43-284. With a one-pair battery, an equivalent of 

 44'95 parts of amorphous metal was obtained. 



50. One source of variatioii in the resulting numbers of the 

 dark variety appeared to arise from particles of the depositing 

 liquid being mechanically enclosed within the depositing metal, 

 chiefly by the foi'mation of minute cracks and scales; these 

 were, as far as possible, prevented by using cathodes formed of 

 wire, maintaining a uniform temperature and an uninterrupted 

 electric cm-rent, by suitable adaptation of the electric power, and 

 by keeping the cathodes in constant motion. The adhering 

 liquid was removed by washing in dilute hydrochloric acid, di- 

 stilled water, and drying. 



51. The amorphous metal invariably contained a small por- 

 tion of chloride of antimony, more or less of which was always 

 evolved during the molecular change, according to the tempera- 

 ture to which it was raised ; thin pieces, changed under water, 

 still retained the greater portion of the chloride. A thin speci- 

 men, formed upon a copper wire helix, lost by change in air 

 0'337 per cent, of its weight, and a thick one lost 3"55G per 

 cent. The gray variety, when perfectly prepared, evolved scarcely 

 a perceptible odour of burnt tartrates or hydrochloric acid by the 

 application of heat. 



52. To remove the chloride of antimony, portions of thin de- 

 posits were finely pulverized in cold water, then washed either 

 with distilled water, dilute hydrochloric acid, or solution of 

 caustic potash, finally with water and dried : small quantities of 

 the chloride were removed, especially by the dilute acid ; but in 

 each case the powder still retained its thermic property, and 

 evolved chloride of antimony during the change. Other por- 

 tions of the pulverized metal were shaken with boiling hot dilute 

 hydrochloric acid, also boiled in similar acid; the chloride was 

 then found to be more completely removed, and the thermic 

 property destroyed. By digesting the powder in one part of 

 hydrochloric acid and three parts of water, for one week, less 

 chloride was evolved during the change and during the combus- 

 tion succeeding it. 



53. A solid piece of amorphous autimony, weighing 774*0 



