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1
210
The Fairy-Land of Science
·
Arabella B. Buckley
78
But
it
is
not
only
easily
melted
substances
such
as
sugar
and
salt
which
form
crystals.
The
beautiful
stalactite
grottos
are
all
made
of
crystals
of
lime.
Diamonds
are
crystals
of
carbon,
made
inside
the
earth.
Rock-crystals,
which
you
know
probably
under
the
name
of
Irish
diamonds,
are
crystallized
quartz;
and
so,
with
slightly
different
colourings,
are
agates,
opals,
jasper,
onyx,
cairngorms,
and
many
other
precious
stones.
Iron,
copper,
gold,
and
sulphur,
when
melted
and
cooled
slowly
build
themselves
into
crystals,
each
of
their
own
peculiar
form,
and
we
see
that
there
is
here
a
wonderful
order,
such
as
we
should
never
have
dreamt
of,
if
we
had
not
proved
it.
If
you
possess
a
microscope
you
may
watch
the
growth
of
crystals
yourself
by
melting
some
common
powdered
nitre
in
a
little
water
till
you
find
that
no
more
will
melt
in
it.
Then
put
a
few
drops
of
this
water
on
a
warm
glass
slide
and
place
it
under
the
microscope.
As
the
drops
dry
you
will
see
the
long
transparent
needles
of
nitre
forming
on
the
glass,
and
notice
how
regularly
these
crystals
grow,
not
by
taking
food
inside
like
living
beings,
but
by
adding
particle
to
particle
on
the
outside
evenly
and
regularly.
Week
12
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