The country was badly eroded.

The layer of sandstone immediately over this shelf was evidently softer than the general mass; and in other days (centuries ago), when it had formed one level with the bed of the river, it had been deeply eroded.

At the end of one, two, or three hours, there is no change in B and C, while in A the fibrin is gradually being eroded, and finally disappears; but it does not swell up, and the solution at the same time becomes slightly turbid.

Its volcanic cone has been sharply eroded by snow and ice.