GALLERY.] NATURAL HISTORY. 97 
from Dauphiny, and antimonial silver or stibiuret of silver 
from the Hartz, &c. 
Case 4. Native arsenic (formerly called testaceous or 
scherben cobalt) in reniform and botryoidal shapes, from 
Andreasberg, &c.; and its chemical combinations (arse- 
niurets) : with nickel (commonly called copper-nickel); 
with cobalt, comprising the grey and part of the white 
cobalt of some mineralogists, &c. 
The remainder of this Case contains the substances be¬ 
longing to the confined orders of Carbon and of Selenium . 
To the former are referred the diamond, anthracite, gra¬ 
phite ; to the latter the selenium metals or seleniurets. 
Among the specimens selected to illustrate the crystalline 
forms of the diamond are:—the primitive regular octahe¬ 
dron ; the same with solid angles truncated; with edges 
truncated, forming the passage into the rhombic dodeca¬ 
hedron ; varieties of the latter, giving rise to the six-sided 
prismatic and the tetrahedral forms ; cubes with truncated 
and bevelled edges; various hemitropic crystals or macles 
of diamonds ; an octahedral diamond, embedded in gold ; 
another in its usual matrix; models of the largest diamonds 
known, &c. With these are placed specimens of the al¬ 
luvial rock in which this precious substance occurs in 
the East Indies and in Brazil.*—Specimens of anthracite 
or kohlenblende (to which may be referred the Kilkenny 
coal), with native silver from Kongsberg, &c.;— graphite 
(commonly called black-lead), massive, disseminated in 
porcelain earth, &c.— Seleniurets ,—only those of copper 
and silver (eukairite), those of lead and copper, and the 
selenium-sulphur, are at present in the collection. 
Case 5. The suite of specimens of sulphur (crystallized, 
massive, and stalactic, with selenite, sulphate of strontia, 
&c.; and the same found sublimed near the craters of vol¬ 
canos, &c.) is succeeded by the Sulphurets , which occupy 
half of this and seven of the succeeding glass-cases. They 
begin with sulphuret of manganese or manganese-blende, 
from Nagyag in Transylvania and from Peru.—Among 
the numerous varieties of sulphur et of zinc, or zinc-blende, 
may be particularized those relative to colour, viz., the 
yellow, the brown, and the black blende of Werner; the 
first of which is generally most pure, while the others con¬ 
tain a portion of iron; the fibrous blende of Przbram in 
F 
