Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
210
The Fairy-Land of Science
·
Arabella B. Buckley
144
Sometimes
more
water
is
drawn
up
into
the
leaves
than
can
be
used,
and
then
the
leaf
opens
thousands
of
little
mouths
in
the
skin
of
its
under
surface,
which
let
the
drops
out
just
as
drops
of
perspiration
ooze
through
our
skin
when
we
are
overheated.
These
little
mouths,
which
are
called
stomates
(a,
Fig.
42)
are
made
of
two
flattened
cells,
fitting
against
each
other.
When
the
air
is
damp
and
the
plant
has
too
much
water
these
lie
open
and
let
it
out,
but
when
the
air
is
dry,
and
the
plant
wants
to
keep
as
much
water
as
it
can,
then
they
are
closely
shut.
There
are
as
many
as
a
hundred
thousand
of
these
mouths
under
one
apple-leaf,
so
you
may
imagine
how
small
they
often
are.
Plants
which
only
live
one
year,
such
as
mignonette,
the
sweet
pea,
and
the
poppy,
take
in
just
enough
food
to
supply
their
daily
wants
and
to
make
the
seeds
we
shall
speak
of
presently.
Then,
as
soon
as
their
seeds
are
ripe
their
roots
begin
to
shrivel,
and
water
is
no
longer
carried
up.
The
green
cells
can
no
longer
get
food
to
digest,
and
they
themselves
are
broken
up
by
the
sunbeams
and
turn
yellow,
and
the
plant
dies.
But
many
plants
are
more
industrious
than
the
stock
and
mignonette,
and
lay
by
store
for
another
year,
and
our
primrose
is
one
of
these.
Look
at
this
thick
solid
mass
below
the
primrose
leaves,
out
of
which
the
roots
spring.
(See
the
plant
in
the
foreground
of
the
heading
of
the
lecture.)
This
is
really
the
stem
of
the
primrose
hidden
underground,
and
all
the
starch,
albuminoids,
&c.,
which
the
plant
can
spare
as
it
grows,
are
sent
down
into
this
underground
stem
and
stored
up
there,
to
lie
quietly
in
the
ground
through
the
long
winter,
and
then
when
the
warm
spring
comes
this
stem
begins
to
send
out
leaves
for
a
new
plant.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
