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164
Glaucus; Or, The Wonders of the Shore
·
Charles Kingsley
138
“Now
these
globules
consist
of
pure
oxygen,
given
out
by
the
plants
under
the
stimulus
of
light;
and
to
this
oxygen
the
animals
in
the
tank
owe
their
life.
The
difference
between
the
profusion
of
oxygen-bubbles
produced
on
a
sunny
day,
and
the
paucity
of
those
seen
on
a
dark
cloudy
day,
or
in
a
northern
aspect,
is
very
marked.”
Choose,
therefore,
a
south
or
east
window,
but
draw
down
the
blind,
or
throw
a
handkerchief
over
all
if
the
heat
become
fierce.
The
water
should
always
feel
cold
to
your
hand,
let
the
temperature
outside
be
what
it
may.
Next,
you
must
make
up
for
evaporation
by
fresh
water
(a
very
little
will
suffice),
as
often
as
in
summer
you
find
the
water
in
your
vase
sink
below
its
original
level,
and
prevent
the
water
from
getting
too
salt.
For
the
salts,
remember,
do
not
evaporate
with
the
water;
and
if
you
left
the
vase
in
the
sun
for
a
few
weeks,
it
would
become
a
mere
brine-pan.
But
how
will
you
move
your
treasures
up
to
town?
The
simplest
plan
which
I
have
found
successful
is
an
earthen
jar.
You
may
buy
them
with
a
cover
which
screws
on
with
two
iron
clasps.
If
you
do
not
find
such,
a
piece
of
oilskin
tied
over
the
mouth
is
enough.
But
do
not
fill
the
jar
full
of
water;
leave
about
a
quarter
of
the
contents
in
empty
air,
which
the
water
may
absorb,
and
so
keep
itself
fresh.
And
any
pieces
of
stone,
or
oysters,
which
you
send
up,
hang
by
a
string
from
the
mouth,
that
they
may
not
hurt
tender
animals
by
rolling
about
the
bottom.
With
these
simple
precautions,
anything
which
you
are
likely
to
find
will
well
endure
forty-eight
hours
of
travel.
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