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210
The Fairy-Land of Science
·
Arabella B. Buckley
115
Try
and
grasp
this
thoroughly,
for
it
is
difficult
at
first
to
make
people
believe
it.
Suppose
you
were
stone-deaf,
there
would
be
no
such
thing
as
sound
to
you.
A
heavy
hammer
falling
on
an
anvil
would
indeed
shake
the
air
violently,
but
since
this
air
when
it
reached
your
ear
would
find
a
useless
instrument,
it
could
not
play
upon
it.
and
it
is
this
play
on
the
drum
of
your
ear
and
the
nerves
within
it
speaking
to
your
brain
which
make
sound.
Therefore,
if
all
creatures
on
or
around
the
earth
were
without
ears
or
nerves
of
hearing,
there
would
be
no
instrument
on
which
to
play,
and
consequently
there
would
be
no
such
thing
as
sound.
This
proves
that
two
things
are
needed
in
order
that
we
may
hear.
First,
the
outside
movement
which
plays
on
our
hearing
instrument;
and,
secondly,
the
hearing
instrument
itself.
First,
then,
let
us
try
to
understand
what
happens
outside
our
ears.
Take
a
poker
and
tie
a
piece
of
string
to
it,
and
holding
the
ends
of
the
string
to
your
ears,
strike
the
poker
against
the
fender.
You
will
hear
a
very
loud
sound,
for
the
blow
will
set
all
the
particles
of
the
poker
quivering,
and
this
movement
will
pass
right
along
the
string
to
the
drum
of
your
ear
and
play
upon
it.
Now
take
the
string
away
from
you
ears,
and
hold
it
with
your
teeth.
Stop
your
ears
tight,
and
strike
the
poker
once
more
against
the
fender.
You
will
hear
the
sound
quite
as
loudly
and
clearly
as
you
did
before,
but
this
time
the
drum
of
your
ear
has
not
been
agitated.
How,
then,
has
the
sound
been
produced?
In
this
case,
the
quivering
movement
has
passed
through
your
teeth
into
the
bones
of
your
hear,
and
from
them
into
the
nerves,
and
so
produced
sound
in
your
brain.
And
now,
as
a
final
experiment,
fasten
the
string
to
the
mantelpiece,
and
hit
it
again
against
the
fender.
How
much
feebler
the
sound
is
this
time,
and
how
much
sooner
it
stops!
Yet
still
it
reaches
you,
for
the
movement
has
come
this
time
across
the
air
to
the
drums
of
your
ear.
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