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210
The Fairy-Land of Science
·
Arabella B. Buckley
104
But
we
have
not
yet
spoken
of
the
sea,
and
this
surely
is
not
idle
in
altering
the
shape
of
the
land.
Even
the
waves
themselves
in
a
storm
wash
against
the
cliffs
and
bring
down
stones
and
pieces
of
rock
on
to
the
shore
below.
And
they
help
to
make
cracks
and
holes
in
the
cliffs,
for
as
they
dash
with
force
against
them
they
compress
the
air
which
lies
in
the
joints
of
the
stone
and
cause
it
to
force
the
rock
apart,
and
so
larger
cracks
are
made
and
the
cliff
is
ready
to
crumble.
It
is,
however,
the
stones
and
sand
and
pieces
of
rock
lying
at
the
foot
of
the
cliff
which
are
most
active
in
wearing
it
away.
Have
you
never
watched
the
waves
breaking
upon
a
beach
in
a
heavy
storm?
How
they
catch
up
the
stones
and
hurl
them
down
again,
grinding
them
against
each
other!
At
high
tide
in
such
a
storm
these
stones
are
thrown
against
the
foot
of
the
cliff,
and
each
blow
does
something
towards
knocking
away
part
of
the
rock,
till
at
last,
after
many
storms,
the
cliff
is
undermined
and
large
pieces
fall
down.
These
pieces
are
in
their
turn
ground
down
to
pebbles
which
serve
to
batter
against
the
remaining
rock.
Professor
Geikie
tells
us
that
the
waves
beat
in
a
storm
against
the
Bell
Rock
Lighthouse
with
as
much
force
as
if
you
dashed
a
weight
of
3
tons
against
every
square
inch
of
the
rock,
and
Stevenson
found
stones
of
2
tons'
weight
which
had
been
thrown
during
storms
right
over
the
ledge
of
the
lighthouse.
Think
what
force
there
must
be
in
waves
which
can
lift
up
such
a
rock
and
throw
it,
and
such
force
as
this
beats
upon
our
sea-coasts
and
eats
away
the
land.
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