‘simple ixture o: oO or of an 
{ Memoirs of the Amer. rg S.,] v, table to p. 256. 
$ 
‘ 
Storer on the Alloys of Copper and Zinc. 287 
but their edges have the rounded character of the edges of the crystals. 
This general character is maintained throughout the whole series of 
crystals, from those of pure copper down to those of the lowest white 
alloys which I have obtained. No doubt can possibly be entertained 
of the complete resemblance of these crystals to each other throughout 
the series, while the striking similarity to the well-known crystals of pure 
copper (obtained by fusion) which they exhibit, strongly indicates that 
they belong to the regular system. As it is of course impossible to meas- 
ure the angles of such crystals, they cannot be erystallographically deter- 
mined; but the most obvious conclusion is, that they are monometric. 
This opinion, however, must be based rather upon analogy'than on any 
distinct measurements. 
“Upon the assumption that the crystals which I have described belong 
to the regular system, as well as upon the fact, which will appear in the 
sequel, that none of the crystals have been found to contain any larger 
erystalline form of zinc which have hitherto been made. 
A minute deseription with figures of the crystals as obtained from al- 
‘oys of various composition follows. These crystals vary in size accord 
half an inch in Jen , others were quite minute. : 
“Very fine groups of erystals were obtained from those alloys which 
contained only one or two per cent of zine. It is worthy of note, thai 
ee 
It must not be su d that this view supports in the least the idea of the 
older chemists, that fe 4 meena ngtion ‘mixtures’ of thei nt metals. For 
er com ia ; 
the experiments of Karsten (Joc. cit., pp. 898, 400) have already shown that the 
a d © acids 
ani "ings yd 
ie salts, is that of chemical compounds, being entirely unlike that ee 
mechanical mi : 3. 
Ann. Ch, et Phys., [3,] xxii, 37. 
