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mountains. It must have been supplied with
snow and ice, just as a mountain tarn in temperate
regions is supplied with water, and, like the tarn,
must ultimately have discharged its accumulations.
The discharge must have taken place by glaciers
pouring down the outlet valleys. These valleys
should he eroded, smoothed, and striated ; and if
the glaciers were like those now filling the Alpine
and Scandinavian valleys, their moraines should
be discoverable, and of vast magnitude.
But, as already stated, the erosion of the
valleys, the planing down of the mountains, the
striation, and all such indications of tremendous
glacial action are evident and everywhere ; but no
moraines of commensurate magnitude are to be
found. This portion of the difficulty is, I think,
solved by my supposition that the outlet glaciers
spread away over the sea, expired there, and left
their legacies of till at the bottom, as already
stated.
But what are we to say of the ambiguous
deposits that Forbes did observe, “ which at first
sight resemble moraines, but which in their
present form it is difficult or impossible to
identify ” ? I looked for these on my first
journey, found them, and being unable to solve
the riddle, gave it up, as I may well have done,
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