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the snow would lie so thinly, that it would be
melted speedily, and the visible snow-line would
there be much above the original height. Hence
the apparent snow-line would lose its regularity,
and be a waving or zigzag line. If these furrows
were irregular, such as must be formed by the
running waters and sliding avalanches wearing
away the rock in some parts more than in others,
this waving or zigzag line would have a
corresponding irregularity, such as we actually see on
ordinary mountain chains. The path of the
avalanches would now be limited to these furrows,
and as the rock forming the sides of the furrows
or troughs became weather-worn, disintegrated by
frost, or otherwise rendered friable, its loosened
fragments would be torn and dragged down, with
the sliding avalanches, and deposited in heaps at
the bottom.
Now let our supposititious great mountain ridge
assume a more complex form: let there be huge
pyramids and peaks of rock sprouting irregularly
from its sloping side, and toothing the edge of its
summit ridge. There would be a labyrinth of
hollows between these peaks, forming valleys and
basins in the upper ground above the snow-line.
In these the snow would rest and accumulate just
as water accumulates and forms lakes and tarns
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