196 Prof. J. P. Cooke on the Variation of Constitution of a 
mony 
of the crystalline structure, as the character of the phenomenon 
vv 
these limits, the com 
i setulae as that of the alloy. The erysta 
crystals of Sb Zn, 
At the alloy of 33 per cent of zine, the definite rystals " 
Sb Zn? begin to disappear, and are succeeded by thin metallie 
scales, which are obviously imperfect crystals of the same ton 
This was established, not only by the obvious law of continulty 
noticed in the different specimens (the perfect crystals gradually 
but also by the peculiar mode of twit 
ing, W ch was the same with the scales as with the large biel 
tals, eae the peculiar cellular structure already referred io 
Moreover, the angle between two scales thus united was fou 
ora ae 
eS SS oS eee err eter 
