224 Scientific Intelligence. 
in both these instances the zine has been deposited from the 
vapor of metallic zine, while in the other case the heat has not 
been great enough to even melt the asphaltum varnish with 
which the end of the element is covered. Cases of molecular 
re-arrangement are frequent, when this change takes place in 
the interior of a solid mass, but I have never before met with 
a case in which one metal was separated from another by such 
change and projected beyond the surface of the alloy. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
separated. When pure, fluorene has a well pronounced violet 
fluorescence, which disappears on solarization. It fuses at 113. 
The formula C,,H,, was established for it: (1) by an element- 
ary analysis ; (2) by an analysis of the picrate, in which not only 
. 
the carbon and the hydrogen; and (3) by a complete analysis of 
a well-defined bromide. The p 
$0) 0 
(NO,),0. The bromide crystallizes in magnificent ‘clinorhombic. 
tables, fusible at 166°-167°, and has the formula C,,H,Bro- 
yields an oxidation-product crystallizing in fine yellow needles, 
the character of which the author is now studying.— CU. /., Ixxvil, 
44-, Aug., 1873. G. F. B. 
2. On Nitroanthracene and its Derivatives.—More than a year — 
Zo, pT announced that mono-nitranthracene yielded, on 
reduction with tin and hydrochloric acid, not anthracene itself 
ut an isomer of it. He has now still farther examined this sub- 
stance. Its fusing point (247°), so near that of para-anthracene 
(244), suggests its identity with this body. But that this cannot 
€ appears from several facts, First, while para-anthracene by 
heat passes readily into anthracene, its fusing point falling to 213°, 
the new isomer may be repeated y fused and even heated to 30 
without any — in its fusing point. Moreover, its picrate, 
av 
= 
which is formed less easily than the similar anthracene compound, 
