APPENDIX. 
ON THE EXCAVATION OE VALLEYS BY DILUVIAL 
DENUDATION. 
I have reserved for this place, in the form of an Appendix, the 
following details respecting two districts which I have already quoted 
in my specification of the proofs of diluvial action in the south of 
England, because the particulars herein enumerated would have 
interrupted the course of my former argument; and also, because 
they have already been published in the first volume of the New 
Series of the Geol. Trans. Part I., and in the fifth volume of the Old 
Series of the same Transactions, Part II. They relate to the valleys 
of denudation that intersect the coast of Devon and Dorset, and to 
the excavation of valleys and dispersion of beds of gravel in the 
county of Warwick, and along the course of the Cherwell, Evenlode, 
and Thames, from Warwickshire to London. 
We have few opportunities of witnessing by direct experiment 
or observation the force of immense masses of water, in excavating 
hollows on the earth’s surface, and removing to a great distance the 
fragments which they tear away; and were it not for the ravages we 
occasionally see produced by such comparatively trifling causes, as 
the bursting of a dyke in Holland, or of the barrier of an Alpine 
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