182 NATURAL HISTORY. [NORTH 
are the crystallized varieties* the massive and fibrous 
coloured varieties* the red chiefly from Hallein in Tyrol* 
the blue and violet from Ischel in Upper Austria; the 
stalactical rock salt from Mexico* &c Chloride of am¬ 
monium or sal-ammoniac , from Vesuvius* Saint Etienne en 
Forez* &c.— Chlorides of lead: to these belong, the co- 
tunnite from Vesuvius; the basic muriate of lead from 
Mendip; and the murio-carhonate of lead from Derby¬ 
shire, of which most rare substance a considerable suite is 
deposited in this glass Case.— Chloride of copper or ataca - 
mite * in crystallized splendid groups* chiefly from Remo- 
linos, Soli dad and Veta negra della Pampa larga* in Chili; 
what was originally termed Peruvian green sand* or ataca- 
mite (being obtained from the desert of Atacama between 
Chili and Peru) is now known to be artificially produced 
by pounding the crystallized and laminar varieties for the 
purpose of using the sand (arenilla) in lieu of blotting 
paper.— Chloride (or muriate) of silver * called also horn- 
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. 
Case 61 contains a small collection of organico-che- 
mical* 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* many of them 
enclosing insects, &c.; to which* for the sake of com¬ 
parison, are added* specimens of recent copal* likewise 
containing insects; fossil copal or Highgate resin; retinite 
or retinasphalt, found at Bovey ; together with some other 
undetermined resinous substances ; the idrialite, to which 
the bituminous cinnabar is partly referable. To the bitumina 
be-long the varieties of mineral pitch of all degrees of consist¬ 
ence* from the fluid naphtha and mineral oil or petroleum, 
to the solid and hard asphalt and jet or pitch coal; the 
