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210
The Fairy-Land of Science
·
Arabella B. Buckley
76
But
try
the
experiment,
some
night
when
a
heavy
dew
is
expected,
of
spreading
a
thin
piece
of
muslin
over
some
part
of
the
grass,
supporting
it
at
the
four
corners
with
pieces
of
stick
so
that
it
forms
an
awning.
Though
there
may
be
plenty
of
dew
on
the
grass
all
round,
yet
under
this
awning
you
will
find
scarcely
any.
The
reason
of
this
is
that
the
muslin
checks
the
heat-waves
as
they
rise
from
the
grass,
and
so
the
grass-blades
are
not
chilled
enough
to
draw
together
the
water-drops
on
their
surface.
If
you
walk
out
early
in
the
summer
mornings
and
look
at
the
fine
cobwebs
flung
across
the
hedges,
you
will
see
plenty
of
drops
on
the
cobwebs
themselves
sparkling
like
diamonds;
but
underneath
on
the
leaves
there
will
be
none,
for
even
the
delicate
cobweb
has
been
strong
enough
to
shut
in
the
heat-waves
and
keep
the
leaves
warm.
Again,
if
you
walk
off
the
grass
on
to
the
gravel
path,
you
find
no
dew
there.
Why
is
this?
Because
the
stones
of
the
gravel
can
draw
up
heat
from
the
earth
below
as
fast
as
they
give
it
out,
and
so
they
are
never
cold
enough
to
chill
the
air
which
touches
them.
On
a
cloudy
night
also
you
will
often
find
little
or
no
dew
even
on
the
grass.
The
reason
of
this
is
that
the
clouds
give
back
heat
to
the
earth,
and
so
the
grass
does
not
become
chilled
enough
to
draw
the
water-drops
together
on
its
surface.
But
after
a
hot,
dry
day,
when
the
plants
are
thirsty
and
there
is
little
hope
of
rain
to
refresh
them,
then
they
are
able
in
the
evening
to
draw
the
little
drops
from
the
air
and
drink
them
in
before
the
rising
sun
comes
again
to
carry
them
away.
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