Physics and Chemistry. , 113 
use of the "pages comparatively a easy, with the higher powers, in 
the hands of a ce, as now it is with the lower powers under the man- 
agement of an pied microse rath 
The eye-piece works very well when applied to the oh but the 
stereoscopic effect is not equal to that produced when applied to the mi- 
croscope, owing to small angle of the object-glass. I be yer very 
fine views of Saturn and the moon with it; there is some slight loss of 
trouble; and as the condenser of Mr. Tolles’ will no doubt remove this 
difficulty, the mien eye-piece should weber a part of none se i 
upped micro 
- On the Eomibesdons of silica with deutoryd of manganese, oo “Rea 
— directed attention to the constitution of the two minerals Braunite 
and Marceline, and has shown that in order to explain their isomor- 
phism it is necessary to admit that SiO, is, in combination at least, iso 
morphous with MnO,. ue we have 
Braunite, - Ot Nin — Min | Mn Marceline. 
From this appears that all i five degrees of oxydation of manganese 
are isomorphous with other and corresponding oxyds. lggests 
that the deutoxyd of manganese may be called manganous acid Pata 
en » CXxi, 318, Ww. 
On a new cobalt compound. —Bravun has observed that when a a 80- 
Sion of nitrite of potash is added to one cobalto-cyanid of potass 
beautiful dark orange-red color is produced. When the se chied 
is very concentrated, the solution appears intensely blo he re- 
on 
al fr r prake, Chemie, No. 2, 186 
1. Indium.—At a recent session of the Freiberg * Siew ie 
H communicated some further results in regard to this new meta 
Tiecovsred ed by T. Richter and himself.) Two hundred pounds of black 
blende ore from the Himmelfahrt Mine, on treatment with chlorhydric 
wipe and s ubseq uent chai ore and distillation, _ about 43 pounds 
ball 
AE 
a 
5 
fH 
oO 
2s . 
Potassium ; by fu sing alone with the cyanid the oxyd is reduced, but 
only to hatavalans metallic powder. The density of two specimens, 
rolled ee eer 327 and 343 milli igrams, gave 711 _ ag a 
a 1 This Journal, [2], xxxvu, 
‘ hes Jour. Scr.—Srconp Serres, Vo. XXXVIII, oe '712.—Juty, 1864. 
: 15 
