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210
The Fairy-Land of Science
·
Arabella B. Buckley
130
Who
could
be
dull
by
the
side
of
a
brook,
a
waterfall,
or
the
sea,
while
he
can
listen
for
sounds
like
these,
and
picture
to
himself
how
they
are
being
made?
You
may
discover
a
number
of
other
causes
of
sound
made
by
water,
if
you
once
pay
attention
to
them.
Nor
is
it
only
water
that
sings
to
us.
Listen
to
the
wind,
how
sweetly
it
sighs
among
the
leaves.
There
we
hear
it,
because
it
rubs
the
leaves
together,
and
they
produce
the
sound-waves.
But
walk
against
the
wind
some
day
and
you
can
hear
it
whistling
in
your
own
ear,
striking
against
the
curved
cup,
and
then
setting
up
a
succession
of
waves
in
the
hearing
canal
of
the
ear
itself.
Why
should
it
sound
in
one
particular
tone
when
all
kinds
of
sound-waves
must
be
surging
about
in
the
disturbed
air?
This
glass
jar
will
answer
our
question
roughly.
If
I
strike
my
tuning-fork
and
hold
it
over
the
jar,
you
cannot
hear
it,
because
the
sound
is
feeble,
but
if
I
fill
the
jar
gently
with
water,
when
the
water
rises
to
a
certain
point
you
will
hear
a
loud
clear
note,
because
the
waves
of
air
in
the
jar
are
exactly
the
right
length
to
answer
to
the
note
of
the
fork.
If
I
now
blow
across
the
mouth
of
the
jar
you
hear
the
same
note,
showing
that
a
cavity
of
a
particular
length
will
only
sound
to
the
waves
which
fit
it.
do
you
see
now
the
reason
why
pan-pipes
give
different
sounds,
or
even
the
hole
at
the
end
of
a
common
key
when
you
blow
across
it?
Here
is
a
subject
you
will
find
very
interesting
if
you
will
read
about
it,
for
I
can
only
just
suggest
it
to
you
here.
But
now
you
will
see
that
the
canal
of
your
ear
also
answers
only
to
certain
waves,
and
so
the
wind
sings
in
your
ear
with
a
real
if
not
a
musical
note.
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