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210
The Fairy-Land of Science
·
Arabella B. Buckley
15
Then
you
must
understand
what
is
meant
by
chemical
attraction;
and
though
I
can
explain
this
roughly
here,
you
will
have
to
make
many
interesting
experiments
before
you
will
really
learn
to
know
this
wonderful
fairy
power.
If
I
dissolve
sugar
in
water,
though
it
disappears
it
still
remains
sugar,
and
does
not
join
itself
to
the
water.
I
have
only
to
let
the
cup
stand
till
the
water
dries,
and
the
sugar
will
remain
at
the
bottom.
There
has
been
no
chemical
attraction
here.
But
now
I
will
put
something
else
in
water
which
will
call
up
the
fairy
power.
Here
is
a
little
piece
of
the
metal
potassium,
one
of
the
simple
substances
of
the
earth;
that
is
to
say,
we
cannot
split
it
up
into
other
substances,
wherever
we
find
it,
it
is
always
the
same.
Now
if
I
put
this
piece
of
potassium
on
the
water
it
does
not
disappear
quietly
like
the
sugar.
See
how
it
rolls
round
and
round,
fizzing
violently
with
a
blue
flame
burning
round
it,
and
at
last
goes
off
with
a
pop.
What
has
been
happening
here?
You
must
first
know
that
water
is
made
of
two
substances,
hydrogen
and
oxygen,
and
these
are
not
merely
held
together,
but
are
joined
to
completely
that
they
have
lost
themselves
and
have
become
water;
and
each
atom
of
water
is
made
of
two
atoms
of
hydrogen
and
one
of
oxygen.
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