37 
compact and slaty; the former also with petrifac¬ 
tions (coral ore); muriate of mercury^ or corneous 
mercury, with native quicksilver, &c. 
(Case 30.) This case contains (besides some ad¬ 
ditional specimens of gold and mercurial ores, among 
the latter of which is the scarce native amalgam, 
crystallized and globular,) the ores of silver, between 
which and the ores of gold are placed, the alloy, called 
electrum, from Smeof in Siberia, and the auriferous 
silver from Kongsberg in Norway, both being a 
mixture of gold and silver in different proportions. 
Other alloys of silver are the scarce antimonial sil¬ 
ver from Wolfach in the Black Forest, and the 
arsenical silver from Guadalcanal in Andalusia.— 
Among the numerous varieties of native silver may 
be particularized the various imitative forms in 
which it occurs, such as tooth-shaped, wire-shaped, 
dendritical, moss-like, reticular, &c., many of which 
are aggregations of minute crystals.—Common 
sulphuret of silver, or vitreous silver; massive, cry¬ 
stallized, and in other external forms, among which 
are the laminar and capillary.—Brittle vitreous sil¬ 
ver, of which some specimens are also deposited in 
the following table .case.— JVhite silver ore. 
(Case 31.) The ores of silver contained in this 
case are the dark and light-coloured varieties of red 
or rtfdy silver ore, massive, crystallized, and in 
combination with various substances; the black 
silver ore, or sooty silver, which has not been ana¬ 
lysed ; 
SALOON. 
Nat. Hist. 
