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210
The Fairy-Land of Science
·
Arabella B. Buckley
62
When
night
comes,
however,
then
the
land
loses
its
heat
very
quickly,
because
it
has
not
stored
it
up
and
the
land-air
grows
cold;
but
the
sea,
which
has
been
hoarding
the
sun-waves
down
in
its
depths,
now
gives
them
up
to
the
atmosphere
above
it,
and
the
sea-air
becomes
warm
and
rises.
For
this
reason
it
is
now
the
turn
of
the
cold
air
from
the
land
to
spread
over
the
sea,
and
you
have
a
land-breeze
blowing
off
the
shore.
Again,
the
reason
why
there
are
such
steady
winds,
called
the
trade
winds,
blowing
towards
the
equator,
is
that
the
sun
is
very
hot
at
the
equator,
and
hot
air
is
always
rising
there
and
making
room
for
colder
air
to
rush
in.
We
have
not
time
to
travel
farther
with
the
moving
air,
though
its
journeys
are
extremely
interesting;
but
if,
when
you
read
about
the
trade
and
other
winds,
you
will
always
picture
to
yourselves
warm
air
made
light
by
the
heat
rising
up
into
space
and
cold
air
expanding
and
rushing
in
to
fill
its
place,
I
can
promise
you
that
you
will
not
find
the
study
of
aerial
currents
so
dry
as
many
people
imagine
it
to
be.
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