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210
The Fairy-Land of Science
·
Arabella B. Buckley
61
But
how
come
they
to
find
any
empty
space
to
receive
them?
To
answer
this
we
must
go
back
again
to
our
little
active
invisible
fairies
the
sunbeams.
When
the
sun-waves
come
pouring
down
upon
the
earth
they
pass
through
the
air
almost
without
heating
it.
But
not
so
with
the
ground;
there
they
pass
down
only
a
short
distance
and
then
are
thrown
back
again.
And
when
these
sun-
waves
come
quivering
back
they
force
the
atoms
of
the
air
near
the
earth
apart
and
make
it
lighter;
so
that
the
air
close
to
the
surface
of
the
heated
ground
becomes
less
heavy
than
the
air
above
it,
and
rises
just
as
a
cork
rises
in
water.
You
know
that
hot
air
rises
in
the
chimney;
for
if
you
put
a
piece
of
lighted
paper
on
the
fire
it
is
carried
up
by
the
draught
of
air,
often
even
before
it
can
ignite.
Now
just
as
the
hot
air
rises
from
the
fire,
so
it
rises
from
the
heated
ground
up
into
higher
parts
of
the
atmosphere.
and
as
it
rises
it
leaves
only
thin
air
behind
it,
and
this
cannot
resist
the
strong
cold
air
whose
atoms
are
struggling
and
trying
to
get
free,
and
they
rush
in
and
fill
the
space.
One
of
the
simplest
examples
of
wind
is
to
be
found
at
the
seaside.
there
in
the
daytime
the
land
gets
hot
under
the
sunshine,
and
heats
the
air,
making
it
grow
light
and
rise.
Meanwhile
the
sunshine
on
the
water
goes
down
deeper,
and
so
does
not
send
back
so
many
heat-waves
into
the
air;
consequently
the
air
on
the
top
of
the
water
is
cooler
and
heavier,
and
it
rushes
in
from
over
the
sea
to
fill
up
the
space
on
the
shore
left
by
the
warm
air
as
it
rises.
This
is
why
the
seaside
is
so
pleasant
in
hot
weather.
During
the
daytime
a
light
sea-breeze
nearly
always
sets
in
from
the
sea
to
the
land.
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