A SYSTEM OF 
B. Tranfparent, Succimm diaphamm, 
a. Colourlefs. 
b. Yellow. 
The greateft quantity of European 
amber is found inPruffia *, but it is, be- 
fides, colledled on the fea-coaft of the 
province of Skone, and at Biorko, in 
the Lake Malaren, in the province of 
Upland ; as alfo in France and in Si^ 
beria. It is chiefly employed in medi- 
cines, and for making varniflies« 
SECT. CXLVII. 
3 . Rock-oil, Petroleum. 
It is an inflammable mineral, of alight- 
brown colour, which cannot be decompound- 
ed, but is often rendered impure by hetero- 
geneous admixtures. In length of time, it 
hardens in the open air, like a vegetable 
refin, and then becomes of a black colour, 
whether it is pure, or mixed with other bo- 
dies. It is likewife found in the earth 
A. Liquid. 
I. Naphta, Naphta. 
This is faid to be of a very fragrant 
fmell, tranfparent, extremely inflamma- 
ble, and attrads gold. It is gathered 
from the furface of the water in fome 
wells in Perfla. 
SECT. CXLVIIL 
% , Rock-oil, Petroleum.^ proprie fic di5lum. 
This fmells like the oil of amber, 
though more agreeable, and is likewife 
Y^ry ready to take fire. It is colleded 
■ ' in 
