RIVER-DEPOSIT OF THE AMAZON. Ta 
vium, so that some idea may be obtained of the great area occupied 
by the former. The outcrop, as it were, of the underlyi ing strata is 
marked where its composition is known. 
In conclusion, I have to express a hope that by this memoir I 
have brought into notice the general action of a great river, and have 
given a correct though slight record of its work in the economy of 
Nature. 
