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210
The Fairy-Land of Science
·
Arabella B. Buckley
40
Is
it
not
curious
to
think
that
there
is
really
no
such
thing
as
colour
in
the
leaf,
the
table,
the
coat,
or
the
geranium
flower,
but
we
see
them
of
different
colours
because,
for
some
reason,
they
send
back
only
certain
coloured
waves
to
our
eye?
Wherever
you
look,
then,
and
whatever
you
see,
all
the
beautiful
tints,
colours,
lights,
and
shades
around
you
are
the
work
of
the
tiny
sun-waves.
Again,
light
does
a
great
deal
of
work
when
it
falls
upon
plants.
Those
rays
of
light
which
are
caught
by
the
leaf
are
by
no
means
idle;
we
shall
see
in
Lecture
VII
that
the
leaf
uses
them
to
digest
its
food
and
make
the
sap
on
which
the
plant
feeds.
Week
6
We
all
know
that
a
plant
becomes
pale
and
sickly
if
it
has
not
sunlight,
and
the
reason
is,
that
without
these
light-waves
it
cannot
get
food
out
of
the
air,
nor
make
the
sap
and
juices
which
it
needs.
When
you
look
at
plants
and
trees
growing
in
the
beautiful
meadows;
at
the
fields
of
corn,
and
at
the
lovely
landscape,
you
are
looking
on
the
work
of
the
tiny
waves
of
light,
which
never
rest
all
through
the
day
in
helping
to
give
life
to
every
green
thing
that
grows.
So
far
we
have
spoken
only
of
light;
but
hold
your
hand
in
the
sun
and
feel
the
heat
of
the
sunbeams,
and
then
consider
if
the
waves
of
heat
do
not
do
work
also.
There
are
many
waves
in
a
sunbeam
which
move
too
slowly
to
make
us
see
light
when
they
hit
our
eye,
but
we
can
feel
them
as
heat,
though
we
cannot
see
them
as
light.
The
simplest
way
of
feeling
heat-waves
is
to
hold
a
warm
iron
near
your
face.
You
know
that
no
light
comes
from
it,
yet
you
can
feel
the
heat-waves
beating
violently
against
your
face
and
scorching
it.
Now
there
are
many
of
these
dark
heat-
rays
in
a
sunbeam,
and
it
is
they
which
do
most
of
the
work
in
the
world.
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