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751
"
Chesilstowe
?
"
752
"
I
went
there
after
I
left
London
.
You
know
I
dropped
medicine
and
took
up
physics
?
No
;
well
,
I
did
.
Light
fascinated
me
.
"
753
"
Ah
!
"
Отключить рекламу
754
"
Optical
density
!
The
whole
subject
is
a
network
of
riddles
--
a
network
with
solutions
glimmering
elusively
through
.
And
being
but
two-and-twenty
and
full
of
enthusiasm
,
I
said
,
'
I
will
devote
my
life
to
this
.
This
is
worth
while
.
'
You
know
what
fools
we
are
at
two-and-twenty
?
"
755
"
Fools
then
or
fools
now
,
"
said
Kemp
.
756
"
As
though
knowing
could
be
any
satisfaction
to
a
man
!
757
"
But
I
went
to
work
--
like
a
slave
.
And
I
had
hardly
worked
and
thought
about
the
matter
six
months
before
light
came
through
one
of
the
meshes
suddenly
--
blindingly
!
I
found
a
general
principle
of
pigments
and
refraction
--
a
formula
,
a
geometrical
expression
involving
four
dimensions
.
Fools
,
common
men
,
even
common
mathematicians
,
do
not
know
anything
of
what
some
general
expression
may
mean
to
the
student
of
molecular
physics
.
In
the
books
--
the
books
that
tramp
has
hidden
--
there
are
marvels
,
miracles
!
But
this
was
not
a
method
,
it
was
an
idea
,
that
might
lead
to
a
method
by
which
it
would
be
possible
,
without
changing
any
other
property
of
matter
--
except
,
in
some
instances
colours
--
to
lower
the
refractive
index
of
a
substance
,
solid
or
liquid
,
to
that
of
air
--
so
far
as
all
practical
purposes
are
concerned
.
"
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758
"
Phew
!
"
said
Kemp
.
"
That
's
odd
!
But
still
I
do
n't
see
quite
...
I
can
understand
that
thereby
you
could
spoil
a
valuable
stone
,
but
personal
invisibility
is
a
far
cry
.
"
759
"
Precisely
,
"
said
Griffin
.
"
But
consider
,
visibility
depends
on
the
action
of
the
visible
bodies
on
light
.
Either
a
body
absorbs
light
,
or
it
reflects
or
refracts
it
,
or
does
all
these
things
.
If
it
neither
reflects
nor
refracts
nor
absorbs
light
,
it
can
not
of
itself
be
visible
.
You
see
an
opaque
red
box
,
for
instance
,
because
the
colour
absorbs
some
of
the
light
and
reflects
the
rest
,
all
the
red
part
of
the
light
,
to
you
.
If
it
did
not
absorb
any
particular
part
of
the
light
,
but
reflected
it
all
,
then
it
would
be
a
shining
white
box
.
Silver
!
A
diamond
box
would
neither
absorb
much
of
the
light
nor
reflect
much
from
the
general
surface
,
but
just
here
and
there
where
the
surfaces
were
favourable
the
light
would
be
reflected
and
refracted
,
so
that
you
would
get
a
brilliant
appearance
of
flashing
reflections
and
translucencies
--
a
sort
of
skeleton
of
light
.
A
glass
box
would
not
be
so
brilliant
,
nor
so
clearly
visible
,
as
a
diamond
box
,
because
there
would
be
less
refraction
and
reflection
.
See
that
?
From
certain
points
of
view
you
would
see
quite
clearly
through
it
.
Some
kinds
of
glass
would
be
more
visible
than
others
,
a
box
of
flint
glass
would
be
brighter
than
a
box
of
ordinary
window
glass
.
A
box
of
very
thin
common
glass
would
be
hard
to
see
in
a
bad
light
,
because
it
would
absorb
hardly
any
light
and
refract
and
reflect
very
little
.
760
And
if
you
put
a
sheet
of
common
white
glass
in
water
,
still
more
if
you
put
it
in
some
denser
liquid
than
water
,
it
would
vanish
almost
altogether
,
because
light
passing
from
water
to
glass
is
only
slightly
refracted
or
reflected
or
indeed
affected
in
any
way
.
It
is
almost
as
invisible
as
a
jet
of
coal
gas
or
hydrogen
is
in
air
.
And
for
precisely
the
same
reason
!
"