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210
The Fairy-Land of Science
·
Arabella B. Buckley
63
We
are
now
able
to
form
some
picture
of
our
aerial
ocean.
We
can
imagine
the
active
atoms
of
oxygen
floating
in
the
sluggish
nitrogen,
and
being
used
up
in
every
candle-flame,
gas-jet
and
fire,
and
in
the
breath
of
all
living
beings;
and
coming
out
again
tied
fast
to
atoms
of
carbon
and
making
carbonic
acid.
Then
we
can
turn
to
trees
and
plants,
and
see
them
tearing
these
two
apart
again,
holding
the
carbon
fast
and
sending
the
invisible
atoms
of
oxygen
bounding
back
again
into
the
air,
ready
to
recommence
work.
We
can
picture
all
these
air-atoms,
whether
of
oxygen
or
nitrogen,
packed
close
together
on
the
surface
of
the
earth,
and
lying
gradually
farther
and
farther
apart,
as
they
have
less
weight
above
them,
till
they
become
so
scattered
that
we
can
only
detect
them
as
they
rub
against
the
flying
meteors
which
flash
into
light.
We
can
feel
this
great
weight
of
air
pressing
the
limpet
on
to
the
rock;
and
we
can
see
it
pressing
up
the
mercury
in
the
barometer
and
so
enabling
us
to
measure
its
weight.
Lastly,
every
breath
of
wind
that
blows
past
us
tells
us
how
this
aerial
ocean
is
always
moving
to
and
fro
on
the
face
of
the
earth;
and
if
we
think
for
a
moment
how
much
bad
air
and
bad
matter
it
must
carry
away,
as
it
goes
from
crowded
cities
to
be
purified
in
the
country,
we
can
see
how,
in
even
this
one
way
alone,
it
is
a
great
blessing
to
us.
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