CHAPTER VI.

STRATIFIED ROCKS OF MECHANICAL ORIGIN--FURTHER ILLUSTRATIONS.

Impossible to witness the Formation of Stratified Rocks in the Depths of the Ocean--On a small scale Examples are exhibited by Rivers and Lakes--Alluvial Plains--their extraordinary Fertility --Great Basin of the Nile--Experiments of the Royal Society--The Mississippi and the Orinoco--Some Rivers fill up their own Channels--Case of the River Po--Artificial Embankments--Large Tract of Alluvial Soil deposited by the Rhone in the Lake of Geneva--Deltas--The Delta of the Ganges and Brahmapootra--Delta of the Nile, 100