118 
negative metallic substances (metalloids), and their not 
oxidized combinations.— Tellurium and tellur els: the 
scarce native tellurium , which (like sulphur and sele¬ 
nium, &c.) has the property of mineralising several 
metals, combining with them as electro-negative sub¬ 
stance : with bismuth (formerly called molybdena-silver, 
and considered by Esmark as native tellurium); with 
lead (foliated tellurium, or nagyag ore) ; with silver and 
lead (white and partly yellow tellurium); with silver 
and gold (graphic tellurium or schrift-ertz of authors).— 
Native antimony 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; with bismuth , called bis¬ 
muth-blende, in small hair-brown globules from Schnee- 
berg in Saxony: a scarce mineral substance which, ac¬ 
cording to Kersten, is a silicate of bismuth. 
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 trun¬ 
cated and bevilled 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 alluvial 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 
i Kongsberg, 
LONG 
GALLERY. 
Nat. Hist, 
