J. P. Cooke on Stibiotrizincyle and Stibiobizincyle. 235 
1. 2. 3. 4. 
Antimony, 56°94 57-24 56°50 56°93 
Zine, 43-06 42°83 43:06 A3°15 
100:00 ~=100-07 99:56 100-08 
There can be no doubt therefore that an alloy which contains 
57 per cent. of antimony and 43 per cent. of zine will give erys- 
tals which have a composition corresponding to Sb Zns. 
__ It was found however that the same prismatic crystals could 
be obtained from melted alloys which contained proportionally a 
much larger amount of zinc, but not from those which contained 
less. As the amount of zinc in the alloy was increased, the crys- 
tals became less and less abundant, until they seemed to fade out 
when the amount had been increased to about 84 percent. A 
series of analyses were made in order to ascertain how far the 
composition of the melted alloy influenced the composition of the 
crystals which were formed in it. 'The results of these analyses 
are given in the following table. In the left hand column are 
given the per cents. of zinc in the alloys from which the crystals 
crystallized. In the right the per cents. of zine found in these 
crystals on analysis. With a few exceptions in these analyses 
the zinc only was determined. The zinc per cents. marked with 
my name however, are from complete analyses. 
Per cent, of zine in the alloy. Per cent. ¥i 3 o Ce eur 
3 si ie - - 44:14 Cooke. 
44 & ‘ * * * 44:26 Eliot. 
46 «& " * - - 46:77 Eliot 
48... - “ be “ 48:66 Eliot 
50. i ee “ - 46:89 Cooke 
a z ‘ - A728 Homer 
When the per cent. of zinc is further increased in the alloy, it 
falls off in the crystals, and the alloy of 53 per cent. of zinc gives 
crystals which contain one per cent. less zine than those obtained 
— alloy of 49 per cent. It is eens? to say that well de- 
€d crystals s selected for analysis. 
Crystals eae from most of the different alloys of the 
last table, and were found to have the same form considering the 
Vatlation already noticed, as the one figured and described. I 
