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somewhere, according to the circumstances of the
rivulet.
Besides this fine dust, there are the larger pieces
of rock that formed the teeth of the file, and the
rock fragments that rest on the surface of the
glacier, forming its “moraines.” A familiar example
will best explain the nature and formation of these.
The Mer de Glace moves at an average rate of
about sixteen inches daily. This glacier, with its
tributaries, is about twenty miles long, and a block
of stone would be about two hundred years travelling
from the top of the glacier to the end.
Such a block now discharged at the bottom must
therefore have started at about the time of the
foundation of the Royal Society, and have been
travelling ever since. Fragments are continually
falling on the glaciers from the precipitous walls
of the sides of the valley through which they flow.
At the foot of precipices, where there is no glacier,
there is usually a talus, or heap of stones, the
accumulation of ages, each fragment resting where
it fell; but when a stone falls upon the glacier it
moves on, the next takes its place behind this
one, and thus a line, instead of a talus or heap, is
formed. According to the nature of the valley
through which the glacier passes, the amount of
precipitous wall, the friability of the rock, &c., &c.,
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