\« 



%6z A SYSTEM OF 



j. Cornelians in form of fhclls, from 

 the river Tomm in Siberia. 



2. A gat in form of wood. Such a 

 piece is faid to be in the collection 

 of Count Teflih. 



3. Coralloids of white flint, (Milkpora) 

 found in Gottland. 



4. Wood of ye] low flint. Italy, Adrian- 

 ople, and Lcughneagh, a lake in 

 Ireland. 



SECT, CCLXXXI1I. 



€. Extraneous bodies changed into clay. 

 Argillaceous changes, Larva argillacea. 

 a> Looie and friable. 

 1. Of porcellane clay. 

 a. In form of vegetables. 



A piece of white porcellane clay 

 from Japan, with all the marks of 

 the root of a tree, has been ob- 

 ferved in a certain collection, 

 i. Indurated. 



j. In an unknown clay. 



a. In form 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 Pbyji ca- 

 liche Behtjligungen. 



A fort of foffil ivory is faid 

 to be found, which has the 

 properties of a clay ; but I do 

 not know if it is rightly ex- 

 amined, 



SECT. 



