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the valleys of denudation. The surface at Winterwell Spring 

 is about twenty feet above the FuUers Earth, and that of 

 the Thames Head a little more. I think Mr. Tattnton says 

 twenty-nine feet, but I have been unable to ascertain this 

 myself. These remarks on springs are incidentally introduced, 

 but at a future period I may return to this subject, and the 

 Springs of the Upper Thames Watershed and their voliune, will 

 afford abundant matter for another paper. 



