13 
rangement of this collection, a natural order saloon. 
founded on external characters has been follow- Nat. hist. 
ed: not, however, without consulting the che¬ 
mical composition of the substances, so far as 
convenience would admit. Each of the glazed 
table-cases has its number inscribed on the upper 
part of the middle square of glass. 
Case 1, contains the combustible substances^ 
among which may be particularized the different 
varieties of bitumen , from the fluid naphtha , to the 
solid jet (pitch coal of Werner) and the mineral 
caoutchouc from Derbyshire. (See British Collec¬ 
tion : Derbyshire.) With these is placed an in¬ 
flammable fossil substance found by Humboldt 
in South America, where it is called dapeche , 
which has several of the properties of the common 
caoutchouc or India rubber; also the retinasphaU 
turn found at Bovey, and that from Wildshut and 
Bergen in Bavaria; the peculiar resinous sub¬ 
stance discovered in digging the tunnel at High- 
gate, &c.— Amber , the yellow and white varie¬ 
ties: fragments inclosing insects.— Sulphur , crys¬ 
tallized and massive, with selenite, sulphate of 
strontian, &c.; the same found sublimed near the 
craters of volcanos.-— Graphite , commonly called 
black lead, massive, disseminated in porcelain 
earth, &c. (See British Collection: Cumberland.) 
—A few specimens of black coal.—Brown coal , 
to which belongs the well known Bovey coal,— 
Bysodile , or papyraceous brown coal.—Among 
the specimens of anthracite or kohlenblende (to 
which 
