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210
The Fairy-Land of Science
·
Arabella B. Buckley
28
After
hearing
this
you
will
not
be
astonished
that
such
a
monster
should
give
out
an
enormous
quantity
of
light
and
heat;
so
enormous
that
it
is
almost
impossible
to
form
any
idea
of
it.
Sir
John
Herschel
has,
indeed,
tried
to
picture
it
for
us.
He
found
that
a
ball
of
lime
with
a
flame
of
oxygen
and
hydrogen
playing
round
it
(such
as
we
use
in
magic
lanterns
and
call
oxy-
hydrogen
light)
becomes
so
violently
hot
that
it
gives
the
most
brilliant
artificial
light
we
can
get
-
such
that
you
cannot
put
your
eye
near
it
without
injury.
Yet
if
you
wanted
to
have
a
light
as
strong
as
that
of
our
sun,
it
would
not
be
enough
to
make
such
a
lime-ball
as
big
as
the
sun
is.
No,
you
must
make
it
as
big
as
146
suns,
or
more
than
146,000,000
times
as
big
as
our
earth,
in
order
to
get
the
right
amount
of
light.
Then
you
would
have
a
tolerably
good
artificial
sun;
for
we
know
that
the
body
of
the
sun
gives
out
an
intense
white
light,
just
as
the
lime-
ball
does,
and
that
,
like
it,
it
has
an
atmosphere
of
glowing
gases
round
it.
But
perhaps
we
get
the
best
idea
of
the
mighty
heat
and
light
of
the
sun
by
remembering
how
few
of
the
rays
which
dart
out
on
all
sides
from
this
fiery
ball
can
reach
our
tiny
globe,
and
yet
how
powerful
they
are.
Look
at
the
globe
of
a
lamp
in
the
middle
of
the
room,
and
see
how
its
light
pours
out
on
all
sides
and
into
every
corner;
then
take
a
grain
of
mustard-seed,
which
will
very
well
represent
the
comparative
size
of
our
earth,
and
hold
it
up
at
a
distance
from
the
lamp.
How
very
few
of
all
those
rays
which
are
filling
the
room
fall
on
the
little
mustard-seed,
and
just
so
few
does
our
earth
catch
of
the
rays
which
dart
out
from
the
sun.
And
yet
this
small
quantity
(1/2000-millionth
part
of
the
whole)
does
nearly
all
the
work
of
our
world.
(These
and
the
preceding
numerical
statements
will
be
found
worked
out
in
Sir
J.
Herschel's
'Familiar
Lectures
on
Scientific
Subjects,'
1868,
from
which
many
of
the
facts
in
the
first
part
of
the
lecture
are
taken.)
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