sometimes
causes
delay.
There
are
even
periods,
in
times
of
aridity,
when
they
dry
up
altogether.
They
do
not
cease
to
flow
from
the
source,
but
it
is
so'
feebly
as
to
be
barely
perceptible.
These
rivers
carry
little
or
no
merchandise,
and,
therefore,
for
the
public
need,
it
must
be
taken
to
them.
It
is
necessary,
at
the
same
time,
that
art
should
assist
nature,
and
find
the
means
of
enlarging
them,
either
by
canals,
or
by
the
help
of
other
rivers
of
the
same
kind,
which
are
joined
together
and
united
to
it,
which
rivers
thus
joined
increase
the
body
of
water,
and,
helping
each
other,
put
themselves
in
a
condition
to
carry
a
few
small
boats,
not
to
the
sea,
but
to
some
of
the
chief
rivers,
of
which
we
shall
speak
later.
Such
beings
have
usually
little
depth
of
spiritual
life.
They
work
outwardly,
and
rarely
quit
their
meditations,
so
that
they
are
not
fit
for
great
things.
In
general
they
carry
no
mer-chandise
—
that
is
to
say,
they
can
impart
nothing
to
others
;
and
God
seldom
uses
them,
unless
it
be
to
carry
a
few
little
boats
—
that
is,
to
minister
to
bodily
necessities
;
and
in
order
to
be
used,
they
must
be
discharged
into
the
canals
of
sensible
graces,
or
