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210
The Fairy-Land of Science
·
Arabella B. Buckley
56
Perhaps
you
will
wonder
how
it
is
that
if
we
have
a
weight
of
15
lbs.
pressing
on
every
square
inch
of
our
bodies,
it
does
not
crush
us.
And,
indeed,
it
amounts
on
the
whole
to
a
weight
of
about
15
tons
upon
the
body
of
a
grown
man.
It
would
crush
us
if
it
were
not
that
there
are
gases
and
fluids
inside
our
bodies
which
press
outwards
and
balance
the
weight
so
that
we
do
not
feel
it
at
all.
This
is
why
Mr.
Glaisher's
veins
swelled
and
he
grew
giddy
in
thin
air.
The
gases
and
fluids
inside
his
body
were
pressing
outwards
as
much
as
when
he
was
below,
but
the
air
outside
did
not
press
so
heavily,
and
so
all
the
natural
condition
of
his
body
was
disturbed.
I
hope
we
now
realize
how
heavily
the
air
presses
down
upon
our
earth,
but
it
is
equally
necessary
to
understand
how,
being
elastic,
it
also
presses
upwards;
and
we
can
prove
this
by
a
simple
experiment.
I
fill
this
tumbler
with
water,
and
keeping
a
piece
of
card
firmly
pressed
against
it,
I
turn
the
whole
upside-
down.
When
I
now
take
my
hand
away
you
would
naturally
expect
the
card
to
fall,
and
the
water
to
be
spilt.
But
no!
the
card
remains
as
if
glued
to
the
tumbler,
kept
there
entirely
by
the
air
pressing
upwards
against
it.
(The
engraver
has
drawn
the
tumbler
only
half
full
of
water.
The
experiment
will
succeed
quite
as
well
in
this
way
if
the
tumbler
be
turned
over
quickly,
so
that
part
of
the
air
escapes
between
the
tumbler
and
the
card,
and
therefore
the
space
above
the
water
is
occupied
by
air
less
dense
than
that
outside.)
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