mineral species independent of Phenomena of Isomorphism. 195 
Parts of zinc, and 57-2 parts of antimony. ‘They are then com- 
paratively large, generally aggregated, and, as the three analyses 
cited in the accompanying Table indicate, they have the same 
Composition as the alloy. 
Composition of the alloy by Composition of the crystals by 
synthesis, ‘ analysis: — 
Per cent Per cent Per cent Per cent Sum. 
of Zn, of Sb. Zn. of Sb. 
42°80 58°20 43°15 56°93 100°08 
* te 4306 56°50 99°56 
™ “ 42839 5724  100°07 
On increasing graduall f zine in the alloy up to 
gradually the amount of zinc in yap 
48°7, the crystals Pi io to have the composition of the alloy ; 
strong tendency to erystallization ; and by pouring It, as it cooled, 
Mone vessel to another, it could be crystallized to the last 
op. On increasing the amount of zine in the alloy to 50°7 per 
rent, the amount of zine found in the crystals was uniformly 
less than it was in the alloy ; but no closer relation between the 
‘Wo could be detected owing, undoubtedly, to the unavoidable 
"regularity in the crystallization of the alloys which contained 
More than 50 per cent of zinc, This arose from a peculiar pasty 
Sondition which the liquid mass assumed at the point of erystalli- 
be Definite crystals, however, were obtained from an alloy 
60 per cent zine containing 55 per cent; above this the crys- 
