GALLERY.] 
NATURAL HISTORY. 
123 
silver and corneous silver : amorphous, botryoidal, in 
laminae, and crystallized in minute cubes and octahedrons, 
from Veta Negra in Chili, the Saxon Erzgebirge, &c. 
—Chloride or muriate of mercury, with native quicksilver 
from Moschel Landsberg, Almaden, &c. 
Cases 61 and 62 contain a small collection of organico- 
chemical, or such mineralized substances as are composed 
after the manner of organic bodies, from which they derive 
their origin. They are divided into salts, resins, bitumen, 
and coal. To the salts belong—the mellate of alumina, 
also called mellite or honey-stone , found in the beds of 
brown coal at Artern in Thuringia; and the oxalate of 
iron, formerly known by the name of resinous iron, but to 
which that of humboldtite is now generally applied.—To 
the resins may be referred—the amber, of the varieties of 
which a considerable suite is deposited in Case 61, many 
of them enclosing insects, &c.; to which, for the sake of 
comparison, are added, specimens of recent copal, likewise 
containing insects; fossil copal or High gate resin; retinite 
or retin-asphalt, found at Bovey ,* together with some other 
undetermined resinous substances. To the bitumina be¬ 
long the mineral pitch of various degrees of consistence, 
from the. fluid naphtha and mineral oil or petroleum , to the 
solid asphalt and jet or pitch coal; the elaterite or elastic 
bitumen of Derbyshire, (a suite of specimens exhibiting all 
degrees of solidity, from that of honey to that of a com¬ 
pact ligneous substance; with which is also placed the 
dapeche, an inflammable fossil substance found by Hum¬ 
boldt in South America, having several properties of the 
common caoutchouc or Indian rubber ;)—the hatchettine, a 
bituminous substance from Merthyr Tydvil in South 
Wales.—Coal: black coal, and brown coal —of these a few 
specimens only are placed in glass Case 62, their different 
varieties being rather objects for a geological collection. 
The arrangement of the secondary fossils in this Gallery 
is proceeded with as expeditiously as circumstances will 
admit. Several upright glazed Cases are fitted up for the 
Class Reptilia, comprising osseous remains of the Batra- 
chian, the Chelonian, the Emydosaurian, and the Enalio- 
saurian Orders. The objects already deposited belong 
chiefly to the two last mentioned natural orders, the first of 
which is divided into the families of the Crocodiles and the 
g 2 
