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210
The Fairy-Land of Science
·
Arabella B. Buckley
30
Now
suppose
I
with
to
touch
you
from
this
platform
where
I
stand,
I
can
do
it
in
two
ways.
Firstly,
I
can
throw
something
at
you
and
hit
you
-
in
this
case
a
thing
will
have
passed
across
the
space
from
me
to
you.
Or,
secondly,
if
I
could
make
a
violent
movement
so
as
to
shake
the
floor
of
the
room,
you
would
feel
a
quivering
motion;
and
so
I
should
touch
you
across
the
whole
distance
of
the
room.
But
in
this
case
no
thing
would
have
passed
from
me
to
you
but
a
movement
or
wave,
which
passed
along
the
boards
of
the
floor.
Again,
if
I
speak
to
you,
how
does
the
sound
reach
you
ear?
Not
by
anything
being
thrown
from
my
mouth
to
your
ear,
but
by
the
motion
of
the
air.
When
I
speak
I
agitate
the
air
near
my
mouth,
and
that
makes
a
wave
in
the
air
beyond,
and
that
one,
another,
and
another
(as
we
shall
see
more
fully
in
Lecture
VI)
till
the
last
wave
hits
the
drum
of
your
ear.
Thus
we
see
there
are
two
ways
of
touching
anything
at
a
distance;
1st,
by
throwing
some
thing
at
it
and
hitting
it;
2nd,
by
sending
a
movement
of
wave
across
to
it,
as
in
the
case
of
the
quivering
boards
and
the
air.
Now
the
great
natural
philosopher
Newton
thought
that
the
sun
touched
us
in
the
first
of
these
ways,
and
that
sunbeams
were
made
of
very
minute
atoms
of
matter
thrown
out
by
the
sun,
and
making
a
perpetual
cannonade
on
our
eyes.
It
is
easy
to
understand
that
this
would
make
us
see
light
and
feel
heat,
just
as
a
blow
in
the
eye
makes
us
see
starts,
or
on
the
body
makes
it
feel
hot:
and
for
a
long
time
this
explanation
was
supposed
to
be
the
true
one.
But
we
know
now
that
there
are
many
facts
which
cannot
be
explained
on
this
theory,
though
we
cannot
go
into
them
here.
What
we
will
do,
is
to
try
and
understand
what
now
seems
to
be
the
true
explanation
of
the
sunbeam.
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