Full resolution (JPEG) - On this page / på denna sida - Chapter XIII
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would carry me over too much space; as would also a
discussion of the theories that have been propounded of
the causes of glacier motion.
The Lodal Glacier exhibits the phenomena of medial
moraines very distinctly and beautifully. It has
travelled a long way, and bears evidence of tributary
streams and much wearing away of mountains. It
spreads out at its lower part, affording, by its shape,
strong confirmation of the theory of Professor James
Forbes, according to which the ice of glaciers is a
viscous or partially fluid mass, that yields resistingly
to gravitation and its resulting pressure, and flows as
water does, only very slowly. The dirty aspect of the
lower part of this glacier is due to the outspreading of
the two medial moraines, until they meet each other
and finally join the lateral moraine. This, I suspect, is
due to the rapid thawing of the lower part of the
glacier during the long summer days. The ice upon
which the moraine rests being protected by this rocky
covering, the moraine is apparently raised, and stands
on a ridge, which, becoming higher and higher and
more steep-sided, the blocks at last slide down its slope,
and are spread out 011 each side of their former position.
This action, continually repeated, would in time
distribute them over the whole surface of the glacier and
obliterate the regular moraine bands that are visible
higher up.
I walked on down the valley, the wild grandeur of
which is most magnificent. At the foot of the glaciers
is a long waste shore of smooth rock, which terminates
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