EXPLANATION OF THE PLATES 
OF THE 
FIRST VOLUME. 
FRONTISPIECE. 
This is explained in pages 236, 237. 
PLATE I. 
Fig. MINERAL DEPOSITS. 
1. Horizontal beds or strata. 
a. Veins or dykes. 
2. Bending strata. 
3. Minerals in detached masses. 
4. Disjoined strata. 
I. A fault. 
PLATE II. 
CRYSTALS, &C. 
b* Octohedrori. 
6. Rough diamond. 
?. Profile of a brilliant-cut stone. 
8. Profile of a rose-cut stone. 
9. Plane of a table-cut stone. 
10. Plane and profile of the Pitt diamond. 
11. Dodecahedron. 
12. Rough garnet. 
13. Six-sided pyramids, joined base to base. 
'14. Regular four-sided prism. 
15. Six-sided prism. 
16. Cube. 
17. Four-sided pyramid having a rhomb for its bast. 
