Dr. Troost on Amber, &c. li 
surface rough, resembling often in roughness and colour, 
the unripe fruit of the orange tree known to the druggists 
by the name of bitter oranges; sometimes its surface re- 
sembles the bark of some oak limbs. This surface is over- 
is deposited, and three on the outside, being the openings 
, i of which the centre one is the largest. 
ie “at 
Pou5, al 
: Bes. the jy 
d, appear to have fed on the sub 
Stance, and to have eaten through the investing coat, by 
of the ng to the change 
oe ground, or from 
other wn pearing to have 
undergon the internal colou: 
is black, and partly cl seem to be in a 
primitive appearance, the colour 
ed witl 
-of junction, nor is the least fragment of lig- 
that the lignite has been deposited after the ar- 
