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The Fairy-Land of Science
·
Arabella B. Buckley
70
What,
then,
becomes
of
all
this
water?
Let
us
follow
it
as
it
struggles
upwards
to
the
sky.
We
see
it
in
our
imagination
first
carrying
layer
after
layer
of
air
up
with
it
from
the
sea
till
it
rises
far
above
our
heads
and
above
the
highest
mountains.
But
now,
call
to
mind
what
happens
to
the
air
as
it
recedes
from
the
earth.
Do
you
not
remember
that
the
air-atoms
are
always
trying
to
fly
apart,
and
are
only
kept
pressed
together
by
the
weight
of
air
above
them?
Well,
so
this
water-laden
air
rises
up,
its
particles,
no
longer
so
much
pressed
together,
begin
to
separate,
and
as
all
work
requires
an
expenditure
of
heat,
the
air
becomes
colder,
and
then
you
know
at
once
what
must
happen
to
the
invisible
vapour,
--
it
will
form
into
tiny
water-drops,
like
the
steam
from
the
kettle.
And
so,
as
the
air
rises
and
becomes
colder,
the
vapour
gathers
into
the
visible
masses,
and
we
can
see
it
hanging
in
the
sky,
and
call
it
clouds.
When
these
clouds
are
highest
they
are
about
ten
miles
from
the
earth,
but
when
they
are
made
of
heavy
drops
and
hang
low
down,
they
sometimes
come
within
a
mile
of
the
ground.
Look
up
at
the
clouds
as
you
go
home,
and
think
that
the
water
of
which
they
are
made
has
all
been
drawn
up
invisibly
through
the
air.
Not,
however,
necessarily
here
in
London,
for
we
have
already
seen
that
air
travels
as
wind
all
over
the
world,
rushing
in
to
fill
spaces
made
by
rising
air
wherever
they
occur,
and
so
these
clouds
may
be
made
of
vapour
collected
in
the
Mediterranean,
or
in
the
Gulf
of
Mexico
off
the
coast
of
America,
or
even,
if
the
wind
is
from
the
north,
of
chilly
particles
gathered
from
the
surface
of
Greenland
ice
and
snow,
and
brought
here
by
the
moving
currents
of
air.
Only,
of
one
thing
we
may
be
sure,
that
they
come
from
the
water
of
our
earth.
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