190 DOCS.
187,
188
FEBRUARY
1916
Once
you
have informed
me
that
you agree
in
principle,
it
will
surely
be
possible
to have
the
details
settled
to
your
satisfaction. This clarification of
our
relationship
does
not
change
in
any
way
that
I
regard
it
as
my
first
and
foremost
duty
to accumulate
savings
for
my boys;
in these
l-1/2
years[3]
I have
already
put
aside
8,000
M
for
them.
Also write
me something
about
Albert’s school affairs
soon.[4] He
said
a
bit
about this
in his
last,
very
dear
letter.
With
regards
to
you
and
kisses
for
the
boys, yours,
A.
E.
P.S. Give
the
boys
calcium
chloride[5]
after
the
midday
meal
(1
teaspoon
of
con-
centrated
solution in
1/2
a
glass
of
water).
This
way
the
calcium
deficiency
in
cooked food
is
compensated.
188. From
Karl Schwarzschild
[at
the Russian
front,]
6 February 1916
Esteemed Mr.
Einstein,
Many
thanks for
your
letter of
January 9th.[1]
I
wrote
about
Jupiter to
Hertz-
sprung,[2]
who
immediately brought my
attention
to
the fact
that
in
the
next few
years
Jupiter will
be
orbiting too
much to
the south
of
us.
This
extreme
precision
is
only
attainable
between
the
zenith and
perhaps
a
declination of
50°.
The
problem
must
therefore be left
to
observatories
more
to
the south. Mr. Freundlich
could be of service
if
he
were
to pick
out stellar transits and occultations.
(It
appears
to
me, though,
that
Mr.
Banachiewicz[3]
has
already
been
engaged
in
this
for
other
purposes.)
In
other
respects,
we
shall
not
be able
to
agree
too
easily
on
Freundlich,
and
I
only
want to
add:
Debating
this
way
and
that
about
him
is
pointless.
I just
think that
he has
already
fallen out with Struve to such
a
degree
that it
would
be
best
if
you
exerted
your
influence toward
obtaining
another
occupation
for
him.[4]
With
regard
to
the inertial
system,
we are
in
agreement.
You
say
that
beyond
the
Milky
Way
conditions could exist under which
the
Galilean
system
is
no
longer
the
simplest.
I
only
contend
that
within
the
Milky Way
such conditions do not
exist. As far
as
very large spaces
are
concerned, your
theory
takes
an
entirely
similar
position
to Riemann’s
geometry,
and
you
are
certainly
not
unaware
that
elliptic geometry
is
derivable from
your theory,
if
one
has
the
entire universe
under
uniform
pressure (energy
tensor
-p, -p, -p,
0).[5]
I cannot
deny
that
you
have
put
the
freedom
extending beyond
it
to
most
fortunate
use.
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