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1
210
The Fairy-Land of Science
·
Arabella B. Buckley
84
But
if
the
vapour
travels
on
till
it
reaches
high
mountains
in
cooler
lands,
such
as
the
Alps
of
Switzerland;
or
is
carried
to
the
poles
and
to
such
countries
as
Greenland
or
the
Antarctic
Continent,
then
it
will
come
down
as
snow,
forming
immense
snow-
fields.
And
here
a
curious
change
takes
place
in
it.
If
you
make
an
ordinary
snowball
and
work
it
firmly
together,
it
becomes
very
hard,
and
if
you
then
press
it
forcibly
into
a
mould
you
can
turn
it
into
transparent
ice.
And
in
the
same
way
the
snow
which
falls
in
Greenland
and
on
the
high
mountains
of
Switzerland
becomes
very
firmly
pressed
together,
as
it
slides
down
into
the
valleys.
It
is
like
a
crowd
of
people
passing
from
a
broad
thoroughfare
into
a
narrow
street.
As
the
valley
grows
narrower
and
narrower
the
great
mass
of
snow
in
front
cannot
move
down
quickly,
while
more
and
more
is
piled
up
by
the
snowfall
behind,
and
the
crowd
and
crush
grow
denser
and
denser.
In
this
way
the
snow
is
pressed
together
till
the
air
that
was
hidden
in
its
crystals,
and
which
gave
it
its
beautiful
whiteness,
is
all
pressed
out,
and
the
snow-crystals
themselves
are
squeezed
into
one
solid
mass
of
pure,
transparent
ice.
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