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210
The Fairy-Land of Science
·
Arabella B. Buckley
48
We
can
easily
prove
that
there
is
no
oxygen
now
in
the
jar.
I
take
out
the
cork
and
let
a
lighted
taper
down
into
the
gas.
If
there
were
any
oxygen
the
taper
would
burn,
but
you
see
it
goes
out
directly
proving
that
all
the
oxygen
has
been
used
up
by
the
phosphorous.
When
this
experiment
is
made
very
accurately,
we
find
that
for
every
pint
of
oxygen
in
air
there
are
four
pints
of
nitrogen,
so
that
the
active
oxygen-atoms
are
scattered
about,
floating
in
the
sleepy,
inactive
nitrogen.
It
is
these
oxygen-atoms
which
we
use
up
when
we
breathe.
If
I
had
put
a
mouse
under
the
bell-jar,
instead
of
the
phosphorus,
the
water
would
have
risen
just
the
same,
because
the
mouse
would
have
breathed
in
the
oxygen
and
used
it
up
in
its
body,
joining
it
to
carbon
and
making
a
bad
gas,
carbonic
acid,
which
would
also
melt
in
the
water,
and
when
all
the
oxygen
was
used,
the
mouse
would
have
died.
Do
you
see
now
how
foolish
it
is
to
live
in
rooms
that
are
closely
shut
up,
or
to
hide
your
head
under
the
bedclothes
when
you
sleep?
You
use
up
all
the
oxygen-atoms,
and
then
there
are
none
left
for
you
to
breathe;
and
besides
this,
you
send
out
of
your
mouth
bad
fumes,
though
you
cannot
see
them,
and
these,
when
you
breathe
them
in
again,
poison
you
and
make
you
ill.
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