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210
The Fairy-Land of Science
·
Arabella B. Buckley
140
When
it
gets
there
it
finds
our
old
friends
the
sun-beams
hard
at
work.
If
you
have
ever
tried
to
grow
a
plant
in
a
cellar,
you
will
know
that
in
the
dark
its
leaves
remain
white
and
sickly.
It
is
only
in
the
sunlight
that
a
beautiful
delicate
green
tint
is
given
to
them,
and
you
will
remember
from
Lecture
II.
that
this
green
tint
shows
that
the
leaf
has
used
all
the
sun-waves
except
those
which
make
you
see
green;
but
why
should
it
do
this
only
when
it
has
grown
up
in
the
sunshine?
The
reason
is
this:
when
the
sunbeam
darts
into
the
leaf
and
sets
all
its
particles
quivering,
it
divides
the
protoplasm
into
two
kinds,
collected
into
different
cells.
One
of
these
remains
white,
but
the
other
kind,
near
the
surface,
is
altered
by
the
sunlight
and
by
the
help
of
the
iron
brought
in
by
the
water.
This
particular
kind
of
protoplasm,
which
is
called
"chlorophyll,"
will
have
nothing
to
do
with
the
green
waves
and
throws
them
back,
so
that
every
little
grain
of
this
protoplasm
looks
green
and
gives
the
leaf
its
green
colour.
It
is
these
little
green
cells
that
by
the
help
of
the
sun-waves
digest
the
food
of
the
plant
and
turn
the
water
and
gases
into
useful
sap
and
juices.
We
saw
in
Lecture
III.
that
when
we
breathe-in
air,
we
use
up
the
oxygen
in
it
and
send
back
out
of
our
mouths
carbonic
acid,
which
is
a
gas
made
of
oxygen
and
carbon.
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