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210
The Fairy-Land of Science
·
Arabella B. Buckley
123
Now
just
in
this
way
the
waves
of
sound,
in
their
manner
of
moving,
cross
and
recross
each
other.
You
will
remember
too,
that
different
sounds
make
waves
of
different
lengths,
just
as
the
tide
makes
a
long
wave
and
the
rain-drops
tiny
ones.
Therefore
each
sound
falls
with
its
own
peculiar
wave
upon
your
ear,
and
you
can
listen
to
that
particular
wave
just
as
you
look
at
one
particular
ripple,
and
then
the
sound
becomes
clear
to
you.
All
this
is
what
is
going
on
outside
your
ear,
but
what
is
happening
in
your
ear
itself?
How
do
these
blows
of
the
air
speak
to
your
brain?
By
means
of
the
following
diagram,
Fig.
33,
we
will
try
to
understand
roughly
our
beautiful
hearing
instrument,
the
ear.
First,
I
want
you
to
notice
how
beautifully
the
outside
shell,
or
concha
as
it
is
called,
is
curbed
round
so
that
any
movement
of
the
air
coming
to
it
from
the
front
is
caught
in
it
and
reflected
into
the
hole
of
the
ear.
Put
your
finger
round
your
ear
and
feel
how
the
gristly
part
is
curved
towards
the
front
of
your
head.
This
concha
makes
a
curve
much
like
the
curve
a
deaf
man
makes
with
his
hand
behind
his
ear
to
catch
the
sound.
Animals
often
have
to
raise
their
ears
to
catch
the
sound
well,
but
ours
stand
always
ready.
When
the
air-waves
have
passed
in
at
the
hole
of
your
ear,
they
move
all
the
air
in
the
passage,
which
is
called
the
auditory,
or
hearing,
canal.
This
canal
is
lined
with
little
hairs
to
keep
out
insects
and
dust,
and
the
wax
which
collects
in
it
serves
the
same
purpose.
But
is
too
much
wax
collects,
it
prevents
the
air
from
playing
well
upon
the
drum,
and
therefore
makes
you
deaf.
Across
the
end
of
this
canal,
a
membrane
or
skin
called
the
tympanum
is
stretched,
like
the
parchment
over
the
head
of
a
drum,
and
it
is
this
membrane
which
moves
to
and
fro
as
the
air-waves
strike
on
it.
A
violent
box
on
the
ear
will
sometimes
break
this
delicate
membrane,
or
injure
it,
and
therefore
it
is
very
wrong
to
hit
a
person
violently
on
the
ear.
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