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210
The Fairy-Land of Science
·
Arabella B. Buckley
95
Week
14
Imagine
to
yourselves
the
whole
of
St.
Paul's
churchyard
filled
with
oyster-shells,
built
up
in
a
large
square
till
they
reached
half
as
high
again
as
the
top
of
the
cathedral,
then
you
will
have
some
idea
of
the
amount
of
chalk
carried
invisibly
past
Bonn
in
the
water
of
the
Rhine
every
year.
Since
all
this
matter,
whether
brought
down
as
mud
or
dissolved,
comes
from
one
part
of
the
land
to
be
carried
elsewhere
or
out
to
sea,
it
is
clear
that
some
gaps
and
hollows
must
be
left
in
the
places
from
which
it
is
taken.
Let
us
see
how
these
gaps
are
made.
Have
you
ever
clambered
up
the
mountainside,
or
even
up
one
of
those
small
ravines
in
the
hillside,
which
have
generally
a
little
stream
trickling
through
them?
If
so,
you
must
have
noticed
the
number
of
pebbles,
large
and
small,
lying
in
patches
here
and
there
in
the
stream,
and
many
pieces
of
broken
rock,
which
are
often
scattered
along
the
sides
of
the
ravine;
and
how,
as
you
climb,
the
path
grows
steeper,
and
the
rocks
become
rugged
and
stick
out
in
strange
shapes.
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