A SYSTEM OF 
j. Carnelians in form of fhells, from 
the river Tomm in Siberia. 
2, A gat in form of v/ood. Such a 
piece is faid to be in the coUeblion 
of Count TeiTm. 
^ . Coralloids of white flint, ( Millepora) 
found in Gottland. 
4 Wood ofyellow flint. Italy, Adrian- 
ople, and Loughneaghj a lake in 
Ireland. 
SECT. CCLXXXIII, 
C. Extraneous bodies changed into clay. 
Argillaceous changes, Larv^ argillace^. 
a* Eoofe and friable, 
I. Of porcellane clay. 
a. In form of vegetables. 
A pie.ce of white porcellane clay 
from Japan, with all the marks of 
the root of a tree, has been ob- 
ferved in a certain collection. 
^ Indurated. 
Jn an unknown clay. ' 
a. In fojrm of vegetables. Ofteo^ 
colla. It is faid to be changed 
roots of the poplar tree, and 
not to confifl of any calcareous 
fubftance. See the Phyfica^ 
liche Beluftigungen, 
A fort of folTil ivory is faid 
to be found, which has the 
properties of a clay ; but I do 
hot know if it is rightly ex- 
gmiped, 
SECT, 
