ME. G. GOEE ON THE PEOPEETIES OE ELEOTEO-DEPO SITED ANTIMONY. 325 
quantity of colourless buttery substance, which was slightly semifluid at 60°Fahr., and 
doubtless consisted of terbromide of antimony and a little aqueous hydrobromic acid, 
but was not further examined. In another case, two portions of the unchanged sub- 
stance lost respectively 18‘42 and 20*40 per cent, of volatile matter by fusion in the 
analysis-tube ; the two portions were parts of a single piece of the deposited substance, 
the one losing 18*42 per cent, being from the upper part, and the other from its lower 
part, as it hung in the electrolyte. 
101. Another mode of gradually discharging its heat was as follows : — A piece -g-th of 
an mch thick was placed upon the surface of mercury at 260° Fahr. during 1^ hours, at 
the end of which time it was found, by repeated contacts of a red-hot wire, to have entirely 
lost its heating power ; its cohesion was greatly increased, and its fractured surface was 
dull and earthy in appearance ; its odour and taste were also acid : a portion was reduced 
to powder ; the powder also possessed an acid taste, and strongly reddened damp litmus 
paper, whilst the powder of the unchanged substance did not. Another piece i^th of 
an inch thick, weighing 23*52 grains, was placed upon platinum foil upon the surface of 
mercury at 265° Fahr., and kept at that temperature forty-five minutes, then cooled and 
weighed; it had lost 1*38 grain =5*86 per cent.; it was then reheated on the foil and 
mercury to 270° Fahr., and touched several times with a red-hot wire, but no signs of 
the change occurred. 
102. The electro-chemical equivalent of this substance was examined in the following 
manner: — Two similar depositing cells, one filled with the chloride solution (90.) and 
the other with the bromide liquid (93.), and containing anodes of antimony and pre- 
viously weighed cathodes of sheet platinum of equal size, were connected in a single line 
with five Smee’s elements, and deposits simultaneously formed upon them during two 
days ; they were then taken out, wiped dry, allowed to stand twelve hours to further dry 
the one from the bromide solution on account of its porosity, and then weighed ; then 
replaced in the liquid to receive further deposits during two days, and again dried and 
weighed. In two determinations of this kind there were obtained respectively 50*07 and 
50*11 parts of the bromide deposit for every 42*5 parts of the chloride deposit, or for 
every single equivalent, or 32*2 parts of zinc consumed; and in two other determinations 
51*2 and 51*4 parts of bromide deposit were obtained. Each of these quantities of 
deposit contains the same amount of metallic antimony, viz. 40 parts, or ^rd of an 
equivalent. The variation in the numbers obtained was probably caused by the porosity 
of the deposit formed in the bromide solution. 
Third variety of active JElectro-deposited Antimony. 
103. A third variety of heat-giving electro-deposited antimony remains to be described, 
and was obtained in the following manner : — Dissolve 1 part by weight of teroxide of anti- 
mony in 15 parts of hydriodic acid of sp. gr. 1*25 ; filter the solution from any oxide that 
may remain undissolved, and electrolyse it by two or three Smee’s elements very feebly 
excited and an anode of antimony in the usual manner, and at a speed of deposition not 
MDCCCLXn. 2 Y 
