DOCS. 323-325 APRIL
1917 315
treatment
will ultimately
never
prove
to
be
(adequately) right.
Newton’s
theory,
for
ex.,
seems
to
describe
the
gravitational field
completely
with
the
potential
p.
This
description proves
to be
insufficient;
the
guv
functions take its
place.
But
I
do not
doubt that the
day
will
come
when this
approach
will
also have to
give
way
to
a
principally
different
one
for
reasons
that
we
do not
anticipate
today.
I
believe
that this
process
of
securing
the
theory
has
no
limit.
I
am
sorry
that
you
have
health
complaints;
I know how
dependent
on
bodily
well-being
the
mental
capacity
for work
is.
It’s
a
similar
story
with
me as
well.[2]
I
am
sending you my
last
paper
together
with these
lines.[3]
The
gist
of its
contents
is,
in
particular,
that the
size of
the
universe
seems
to
be
linked
to
the
mean
density
of matter.
It
is
not at all out
of
the
question
that
in
the
foreseeable
future the statistics
of fixed
stars
will
confirm
or
refute
the
theory.[4]
With
best
regards,
I
am
yours very truly,
A.
Einstein.
324. To
Friedrich Adler
[Berlin,]
13 April
[1917]
Dear
Adler,
I
hope you
have received
my
package.[1]
I
now
have
an
unusual
request:
When
your
affair
is
deliberated in
court,[2]
I
would
like to
be summoned
there
as a
witness; you
should
apply
for this. Do not
think
this
is
senseless;
for not
only
the
circumstances
directly
connected to
the
event
are
clarified
through
witness
accounts,
but
statements
are
also
brought
forward
that
shed
light
on
the character
of
the
perpetrator.[3]- How
much
I
would
like to
discuss
the
relativity
problem
with
you!
I
hope
that
we can
make
up
for this later.
I
am
curious
about
your
arguments.
Easter has
passed,
of
course,
so
I
may expect
them
shortly.[4]
With best
regards,
I
am
yours,
A.
Einstein.
325. To
Willem
de
Sitter
[Berlin,] 14[13]
April
1917[1]
Dear de
Sitter,
I
hope
the
quiet
there
agrees
with
you very
well, so
that
you
are
back to
normal
soon.[2] I
am
considerably
better,
thanks
to
good
care.[3] We
should not