288 Scientific Intelligence. 
it would almost seem advisable to add one or two per cent of zine to the 
metal employed in preparing specimens of erystallized copper for the cabi- 
A similar case is presented by lead, which is very readily erystal- 
ed when it contains a little antimony: a fact well exemplified by the 
beautiful cups of crystals of Krdtzblei, which are prepared by partially 
cooling the metal in ladles, at the Fraukensharner smelt-works near Claus- 
thal, and doubtless in other localities in the Hartz.” 
“Since the crystals rich in copper which have just been described do 
not possess in any marked degree the yellow color peculiar to brass, they 
are somewhat less interesting than those obtained from alloys containing 
more zine. Crystals of the latter can be obtained with the greatest ease 
by remelting old brass, or, better, by filling a Hessian crucible from the 
molten metal of the pots of a brass founder, in which case all annoyance 
from the formation of a false crust of mixed oxyd of zinc and metal is 
obviated.” * * * 
“The most perfect individual crystals were obtained rr quantity of 
ad 
brazier’s solder which repared at the foundry of the Revere 
t Co., in Boston, by fusing together 50 parts of copper with 50 
arts of alloy of about this composition solidifies, and 
have shot up three quarters of an inch, or more, from the bottom of | 
ingot, leaving only a sheet of metal about a quarter of an inch in thick- 
ness on top, which had cooled more slowly by contact with the air. * 
On removing portions of this upper layer, its inferior surface will be found 
over quite a space from alloys containing 57 or 58 per cent of — 
down to those containing only 43 or 44 per cent is next discussed. on 
coal 
upper limit of this fibrous tendency being the lowest—2. ¢., richest in zine 
—which can be rolled or subjected to the various processes 
alloy of peculiar homogeneity occurs ;—its fracture as seen when § ica 
bars are broken, being smooth and compact, and entirely unlike eine, 
_* Journal of the Franklin Institute, [3,] xxxvii, 200. See also Phil. Trane, exis 
867. + Vid. Savart, Ann. de Ch. et Phys., [2,] =i: 6 
