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1
210
The Fairy-Land of Science
·
Arabella B. Buckley
98
Sir
Charles
Lyell,
when
he
was
at
Niagara,
came
to
the
conclusion
that,
taking
one
year
with
another,
these
falls
eat
back
the
cliff
at
the
rate
of
about
one
foot
a
year,
as
you
can
easily
imagine
they
would
do,
when
you
think
with
what
force
the
water
must
dash
against
the
bottom
of
the
falls.
In
this
way
a
deep
cleft
has
been
cut
right
back
from
Queenstown
for
a
distance
of
seven
miles,
to
the
place
where
the
falls
are
now.
This
helps
us
a
little
to
understand
how
very
slowly
and
gradually
water
cuts
its
way;
for
if
a
foot
a
year
is
about
the
average
of
the
waste
of
the
rock,
it
will
have
taken
more
than
thirty-five
thousand
years
for
that
channel
of
seven
miles
to
be
made.
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