Dr. Du Riche Preller—The Engadine Lakes. 453 
that of the Inn; the erosive energy it developes being in direct 
proportion to its volume and fall; whilst its velocity is, of course, 
the greater the more confined is its bed. As has been shown, it is 
the loss of that erosive agency and energy in the Upper Engadine 
by the deflection to the south of the old Inn sources that has led to 
the formation of the four lakes; in other terms they owe their origin 
to the slackening and partial stoppage of fluvial, but never to glacial 
erosion. 
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