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210
The Fairy-Land of Science
·
Arabella B. Buckley
29
In
order
to
see
how
powerful
the
sun's
rays
are,
you
have
only
to
take
a
magnifying
glass
and
gather
them
to
a
point
on
a
piece
of
brown
paper,
for
they
will
set
the
paper
alight.
Sir
John
Herschel
tells
us
that
at
the
Cape
of
Good
Hope
the
heat
was
even
so
great
that
he
cooked
a
beefsteak
and
roasted
some
eggs
by
merely
putting
them
in
the
sun,
in
a
box
with
a
glass
lid!
Indeed,
just
as
we
should
all
be
frozen
to
death
if
the
sun
were
sold,
so
we
should
all
be
burnt
up
with
intolerable
heat
if
his
fierce
rays
fell
with
all
their
might
upon
us.
But
we
have
an
invisible
veil
protecting
us,
made
-
of
what
do
you
think?
Of
those
tiny
particles
of
water
which
the
sunbeams
draw
up
and
scatter
in
the
air,
and
which,
as
we
shall
see
in
Lecture
IV,
cut
off
part
of
the
intense
heat
and
make
the
air
cool
and
pleasant
for
us.
Week
4
We
have
now
learnt
something
of
the
distance,
the
size,
the
light,
and
the
heat
of
the
sun
-
the
great
source
of
the
sunbeams.
But
we
are
as
yet
no
nearer
the
answer
to
the
question,
What
is
a
sunbeam?
how
does
the
sun
touch
our
earth?
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