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HUTTONIAN THEORY. 



413 



Note xix. § 117. 



Tranfportation of Materials by the Sea, 



368. The exiflence of the great and exten- 

 live operations, by which the fpoils of the land 

 are carried all over the ocean, and fpread out 

 on the bottom of it, may be fuppofed to require 

 fome further elucidation. We mull attend, 

 therefore, to the following circumftances. 



When the detritus of the land is delivered 

 by the rivers into the fea, the heavieft parts are 

 depofited firlt, and the lighter are carried to a 

 greater diftance from the Ihore. , The accumu- 

 lation of matter which would be made in this 

 manner on the coaft, is prevented by the farther 

 operation of the tides and currents, in confe- 

 quence of which the fubftances depofited con- 

 tinue to be worn away, and are gradually re- 

 moved further from the land. The reality of 

 this operation is certain ; for otherwife we (hould 

 have on the fea-fhore a conftant and unlimited 

 accumulation of fand and gravel, which, being 

 perpetually brought down from the land, would 

 continually increafe on the lliore, if nature did 

 not employ fome machinery for removing the 



advanced.. 



