Agassiz, the great advocate of the ice-origin of the Drift, says:

"All these moraines are the land-marks, so to speak, by which we
trace the height and extent, as well as the

[1. Dawkin's "Early Man in Britain," pp. 116, 117.]

{p. 20}

progress and retreat, of glaciers in former times. Suppose, for
instance, that a glacier were to disappear entirely. For ages it has
been a gigantic ice-raft, receiving all sorts of materials on its
surface as it traveled onward, and bearing them along with it; while
the hard particles of rocks set in its lower surface have been
polishing and fashioning the whole surface over which it extended. As
it now melts it drops its various burdens to the ground; bowlders are
the milestones marking the different stages of its journey; the
terminal and lateral moraines are the frame-work which it erected
around itself as it moved forward, and which define its boundaries
centuries after it has vanished."[1]

###

TERMINAL MORAINE.

And Professor Agassiz gives us, on page 307 of the same work, the
above representation of a "terminal moraine."

The reader can see at once that these semicircular