Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
210
The Fairy-Land of Science
·
Arabella B. Buckley
86
But
the
drops
of
water
in
rivers
are
by
no
means
as
pure
as
when
they
rose
up
into
the
sky.
We
shall
see
in
the
next
lecture
how
rivers
carry
down
not
only
sand
and
mud
all
along
their
course,
but
even
solid
matter
such
as
salt,
lime,
iron,
and
flint,
dissolved
in
the
clear
water,
just
as
sugar
is
dissolved,
without
our
being
able
to
see
it.
The
water,
too,
which
has
sunk
down
into
the
earth,
takes
up
much
matter
as
it
travels
along.
You
all
know
that
the
water
you
drink
from
a
spring
is
very
different
from
rain-water,
and
you
will
often
find
a
hard
crust
at
the
bottom
of
kettles
and
in
boilers,
which
is
formed
of
the
carbonate
of
lime
which
is
driven
out
of
the
clear
water
when
it
is
boiled.
The
water
has
become
"hard"
in
consequence
of
having
picked
up
and
dissolved
the
carbonate
of
lime
on
its
way
through
the
earth,
just
in
the
same
way
as
water
would
become
sweet
if
you
poured
it
through
a
sugar-cask.
You
will
also
have
heard
of
iron-springs,
sulphur-springs,
and
salt-springs,
which
come
out
of
the
earth,
even
if
you
have
never
tasted
any
of
them,
and
the
water
of
all
these
springs
finds
its
way
back
at
last
to
the
sea.
And
now,
can
you
understand
why
sea-water
should
taste
salt
and
bitter?
Every
drop
of
water
which
flows
from
the
earth
to
the
sea
carries
something
with
it.
Generally,
there
is
so
little
of
any
substance
in
the
water
that
we
cannot
taste
it,
and
we
call
it
pure
water;
but
the
purest
of
spring
or
river-water
has
always
some
solid
matter
dissolved
in
it,
and
all
this
goes
to
the
sea.
Now,
when
the
sun-waves
come
to
take
the
water
out
of
the
sea
again,
they
will
have
nothing
but
the
pure
water
itself;
and
so
all
these
salts
and
carbonates
and
other
solid
substances
are
left
behind,
and
we
taste
them
in
sea-water.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
