This is the character of the terminal moraine of Mount Lyell glacier.

These glacierets are too thin and feeble and torpid to break off fragments--they can only _bear_ away what falls on them.

This is the other extreme.

But in the case of ordinary glaciers--ice-streams--the bowlders of the terminal deposit are mixed; the angular or upper-formed predominating in the small existing glaciers of temperate climates, but the rounded or nether-formed greatly predominating in the grand old glaciers of which we have been speaking.

In the terminal deposits of these, especially in the materials pushed into the Lake, it is somewhat difficult to find a bowlder which has not been subjected to severe attrition..