37 
t 
compact and slaty ; the tormer also with petrifac¬ 
tions (coral ore); muriate of mcrcunj, or corneous 
mercury, with native quicksilver, &c. 
{Case 30.) Tills 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 
electrmn, from Smeof in Siberia, and the auriferous 
silver from Kongsberg in Norway, both being a 
mixture of gold and silver in difl'erent proportions. 
Other alloys of silver are the scarce antimonial sil¬ 
ver from A^olfach in the Black Forest, and the 
arsenical silver from Guadalcanal in Andalusia.- 
Annong 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 winch 
are the laminar and capillary.-—Brittle vitreous sil¬ 
ver, of which some specimens are also deposited in 
the following glass case.— JFhite silver ore. 
{Case 31.) The ores of silver contained in this 
case are the dark and light-coloured varieties of red 
or ruby-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 
