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away, leaving interstices between, into
which I could introduce my hand.
There are other situations, where the calcareous
mountains in the Alps, present to
the hasty observer the appearance o f the
most irregular and contorted stratification
imaginable, which is merely an optical
illusion, produced by a variety of cleavages
in the limestone, some ranging at right
angles to the line of dip, and others to the
line of bearing. There is likewise another
cleavage in some of these mountains, which
is curved, and is produced by a tendency
to a globular structure in the mass
of the mountain. At the entrance of the
valley of Lauterbrun, there is a mountain
on the left hand, called in the maps
Hunnen FluJi; the strata in the lower p a it
of this mountain, seen in front, are nearly
horizontal, but on advancing into the valley
of Lauterbrun, the side of the mountain
presents the appearance represented in the
annexed cut.
After studying this mountain several
mornings, at a little distance (for the state
of my knee did not allow me to climb up
and come in contact with it) I satisfied
myself that the apparent irregularity is pro-
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