DOCS.
359,
360
JUNE-JULY
1917 349
I cannot
accept your argument
in
support of
it,
though.[6]
It
is
incorrect,
in
principle,
to force
more mass
into
a
world
that
is
at
equilibrium
with
its world
matter,
without
altering
the
world’s
volume somewhat. In
fact,
the
mass sur-
plus
in the
preferred mass-point corresponds
to
a mass
deficit in
the
continuously
distributed
world
matter,
causing
the
lines
of force
originating
from
the
pre-
ferred
mass-point
to
terminate
eventually
within
space
before
having
traversed
a
quadrant,
in
the
elliptic case,
and
a
semicircle,
in the
properly spherical
one.
A
termination
of
lines of force
at
the
antipodal
point
in
the
absence of
masses
is
an
absurdity,
of
course.
In
the
elliptic world,
it
corresponds
to
the
impossibility
of
the
appearance
of lines
of force of
the
length
n/2R.
I
am
traveling
to Switzerland
now[7]
(address:
16A
Bramberg St., Lucerne,
for
6
weeks).
Cordial
regards,
and best wishes for
your
health![8]
Yours,
A.
Einstein.
360. From Friedrich Adler
Vienna
VIII,
1
Alser
St., 4 July 1917
Dear
Friend,
I
thank
you
heartily
for
your
efforts with
Barth. It
will
work
without
him
as
well.
My wife is
back in Zurich
now (address:
Kathrin
Adler,
Zurich
7,
46
Carmen
St.,
No.
II),
but
I
hope
she
will
return in
a
few weeks.
As
the
children,
or
the
two older
girls,[1]
also
came
here to visit for
a
week
and she
had
to
transport
them
back
again,
which
is not
so
simple, you
know,
under the
current
less than
civilized conditions. As I have heard from Prof.
Jerusalem,[2]
Mach’s
son,
Dr.
Ludwig Mach,
is
now
also in Berlin
(Nieder Schönenweide,
26
Brücken
St.).
He
intends
to
send
me
the
correction
proofs of Mach’s
Optics,[3]
but
I have received
no
messages
from him
directly yet.
Now I
am
back
to
work
on
the coordinate
systems
and
hope
to
come
to
a
close
soon
and
return
again
to
my
main research
on
Mach
and
Kant.[4]
Recently
I
received
a
postcard
from Prof. Ehrenfest in
Leyden,
which
delighted
me.[5]
Judging
from
the
current
post,
I
am
not
sure
if
he
also received
my answer, though.
If
you
find time to write
me a
few
words
again,
I
would be
very pleased.
Most cordial
regards, yours,
Fr.
Adler.