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210
The Fairy-Land of Science
·
Arabella B. Buckley
101
From
this
it
will
happen
that
stones
will
generally
lie
near
to
the
bottom
of
torrents
at
the
foot
of
the
banks
from
which
they
fall,
while
the
gravel
will
be
carried
on
by
the
stream
after
it
leaves
the
mountains.
This
too,
however,
will
be
laid
down
when
the
river
comes
into
a
more
level
country
and
runs
more
slowly.
Or
it
may
be
left
together
with
the
finer
mud
in
a
lake,
as
in
the
lake
of
Geneva,
into
which
the
Rhone
flows
laden
with
mud
and
comes
out
at
the
other
end
clear
and
pure.
But
if
no
lake
lies
in
the
way
the
finer
earth
will
still
travel
on,
and
the
river
will
take
up
more
and
more
as
it
flows,
till
at
last
it
will
leave
this
too
on
the
plains
across
which
it
moves
sluggishly
along,
or
will
deposit
it
at
its
mouth
when
it
joins
the
sea.
Week
15
You
all
know
the
history
of
the
Nile;
how,
when
the
rains
fall
very
heavily
in
March
and
April
in
the
mountains
of
Abyssinia,
the
river
comes
rushing
down
and
brings
with
it
a
load
of
mud
which
it
spreads
out
over
the
Nile
valley
in
Egypt.
This
annual
layer
of
mud
is
so
thin
that
it
takes
a
thousand
years
for
it
to
become
2
or
3
feet
thick;
but
besides
that
which
falls
in
the
valley
a
great
deal
is
taken
to
the
mouth
of
the
river
and
there
forms
new
land,
making
what
is
called
the
"Delta"
of
the
Nile.
Alexandria,
Rosetta,
and
Damietta,
are
towns
which
are
all
built
on
land
made
of
Nile
mud
which
was
carried
down
ages
and
ages
ago,
and
which
has
now
become
firm
and
hard
like
the
rest
of
the
country.
You
will
easily
remember
other
deltas
mentioned
in
books,
and
all
these
are
made
of
the
mud
carried
down
from
the
land
to
the
sea.
The
delta
of
the
Ganges
and
Brahmapootra
in
India,
is
actually
as
large
as
the
whole
of
England
and
Wales,
(58,311
square
miles.)
and
the
River
Mississippi
in
America
drains
such
a
large
tract
of
country
that
its
delta
grows,
Mr.
Geikie
tells
us,
at
the
rate
of
86
yards
in
year.
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