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210
The Fairy-Land of Science
·
Arabella B. Buckley
133
All
these
life-sounds
are
made
by
creatures
which
do
not
sing
or
speak;
but
the
sweetest
sounds
of
all
in
the
woods
are
the
voices
of
the
birds.
All
voice-sounds
are
made
by
two
elastic
bands
or
cushions,
called
vocal
chords,
stretched
across
the
end
of
the
tube
or
windpipe
through
which
we
breathe,
and
as
we
send
the
air
through
them
we
tighten
or
loosen
them
as
we
will,
and
so
make
them
vibrate
quickly
or
slowly
and
make
sound-waves
of
different
lengths.
But
if
you
will
try
some
day
in
the
woods
you
will
find
that
a
bird
can
beat
you
over
and
over
again
in
the
length
of
his
note;
when
you
are
out
of
breath
and
forced
to
stop
he
will
go
on
with
his
merry
trill
as
fresh
and
clear
as
if
he
had
only
just
begun.
This
is
because
birds
can
draw
air
into
the
whole
of
their
body,
and
they
have
a
large
stock
laid
up
in
the
folds
of
their
windpipe,
and
besides
this
the
air-chamber
behind
their
elastic
bands
or
vocal
chords
has
two
compartments
where
we
have
only
one,
and
the
second
compartment
has
special
muscles
by
which
they
can
open
and
shut
it,
and
so
prolong
the
trill.
Only
think
what
a
rapid
succession
of
waves
must
quiver
through
the
air
as
a
tiny
lark
agitates
his
little
throat
and
pours
forth
a
volume
of
song!
The
next
time
you
are
in
the
country
in
the
spring,
spend
half
an
hour
listening
to
him,
and
try
and
picture
to
yourself
how
that
little
being
is
moving
all
the
atmosphere
round
him.
Then
dream
for
a
little
while
about
sound,
what
it
is,
how
marvellously
it
works
outside
in
the
world,
and
inside
in
your
ear
and
brain;
and
then,
when
you
go
back
to
work
again,
you
will
hardly
deny
that
it
is
well
worth
while
to
listen
sometimes
to
the
voices
of
nature
and
ponder
how
it
is
that
we
hear
them.
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