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210
The Fairy-Land of Science
·
Arabella B. Buckley
109
You
have
only
to
look
at
the
stream
flowing
from
the
mouth
of
a
glacier
to
see
what
a
quantity
of
soil
it
has
ground
off
from
the
bottom
of
the
valley;
for
the
water
is
thick,
and
coloured
a
deep
yellow
by
the
mud
it
carries.
This
mud
soon
reaches
the
rivers
into
which
the
streams
run;
and
such
rivers
as
the
Rhone
and
the
Rhine
are
thick
with
matter
brought
down
from
the
Alps.
The
Rhone
leaves
this
mud
in
the
Lake
of
Geneva,
flowing
out
at
the
other
end
quite
clear
and
pure.
A
mile
and
a
half
of
land
has
been
formed
at
the
head
of
the
lake
since
the
time
of
the
Romans
by
the
mud
thus
brought
down
from
the
mountains.
Thus
we
see
that
ice,
like
water,
is
always
busy
carving
out
the
surface
of
the
earth,
and
sending
down
material
to
make
new
land
elsewhere.
We
know
that
in
past
ages
the
glaciers
were
much
larger
than
they
are
in
our
time;
for
we
find
traces
of
them
over
large
parts
of
Switzerland
where
glaciers
do
not
now
exist,
and
huge
blocks
which
could
only
have
been
carried
by
ice,
and
which
are
called
"erratic
blocks,"
some
of
them
as
big
as
cottages,
have
been
left
scattered
over
all
the
northern
part
of
Europe.
These
blocks
were
a
great
puzzle
to
scientific
men
till,
in
1840,
Professor
Agassiz
showed
that
they
must
have
been
brought
by
ice
all
the
way
from
Norway
and
Russia.
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