138 
THE GEOLOGIST. 
2. The distribution of strata^ and the accordance of parti= 
cular rocks at the various elevations^ or otherwise. 
3. A tabular statement of the number of genera and spe- 
cies of plants in each of the natural orders,, for which 
we have annexed a list, and the subdivision of these 
according to the soils of the district*. (This enumera- 
tion had better be made in columns — to the left of the 
page place the designations of the natural orders at 
length, and to the right a sufficient number of columns 
for the general estimate and each of the several strata.) 
The Natural Orders of Plants, 
According to the arrangement of Lindley (Nat. System of 
Botany, 2nd. Edition, 1836.) 
Class I. — ExoGEN^; or Di- Order 11. Umbelliferse, 
COTYLEDONES. 12. Araliaccse. 
Sub-Class I. PoLYPETAL^. 13. Grossulacese. 
Order 1. Ranunculacese. 14. Escalloniacese. 
Sub-Order. Podophyllese. 15. Bruniacese. 
2. Papaveracese. 16. Berberacese. 
Sub-Order Eumarise. 17. Vitacese. 
3. Nymphseacese. 18. Pittosporacese. 
Sub-Order Hydropeltidese. 19. Olacacese. 
4. Nelumbiacese. 20. Erancoacese. 
5. Cephalotacese. 21. Sarreceniacese. 
6. M3rristicacese. 22. Onagracese. 
7. Magnoliacese. Sub-Order Circseese. 
8. Winteraceje. Sub-Order Hydi'ocaryes. 
9. Anonacese. Sub-Order Haloragese. 
10. Dilleniacese. 23. Combretacese. 
* Observers must be cautious in not regarding surface soil as the only indica- 
tion of sub-soil — for although a chalky soil almost invariably indicates chalk at a 
very small depth from the surface, yet the loams and clays are often only com- 
mon coverings of numerous and important strata. 
