Abstract
Aggradation of the bed of a river is a well-known and common phenomenon in certain circumstances, but in the present case a mountain stream, whose grade is to steep that waterfall are present, is found flowing along the top of a well-marked but very irregular ridge to tufa. This is found in a little stream near the village of Binn, known to mineralogists for the rare minerals which occur in metamorphosed Triassic dolomite not far away up the valley of the Binna.

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