DOCS.
315,
316 MARCH
1917
307
or
here
somewhere in
the
countryside?
There
are
several
places
in
our
eastern
provinces
as
well
as on
the
seashore where
one
could
stay comfortably
for
a
few
weeks;
and
you
could make
your
selection such
that
you
are
not
entirely
shut
off
from
scientific interaction
but
do not have
to
join
the
daily
discussions. If
we
can
be of
any
assistance in this
regard,
I
ask
you please
to tell
me.
But
perhaps
the
Swiss
air
is
better
for
you
after
all,
and
naturally you
will be
attracted
by
the
prospect of
having your
children
nearby.[3]
In
the
meantime,
...
I
have set
up
a
“Lagrangian function,”
dependent
only
on
the
present-day
distances
r
and velocities
v,
for
an
arbitrary
number of
celestial bodies.
Precisely
in
the
second-order terms
(in
which form
they
must
be considered in
the
explanation
of
Mercury’s perihelion motion)
this
function
assumes
the
following
formal:[4]
L
=
^
E(*)
!
4
+
Ri
+
77
£(X?K3
iyt
+
v])
-
7(vi

"i)
+
+
IV
C I
.0¿iO¿
3
í
OLiQt\
aiO-\
1
OiiOi2!
+
a,a2
,
i__
5
V
Rj
Ri
)
ri
rij
2r?-
7TC
,
/1
1 1
----1"--1“
-
« VijTji
rjira
TuTij
After
the
conversations
you
had with
our
Berlin
colleagues
last
fall,
I
received
very friendly
letters from
Planck and
Waldeyer.[5]
I have not
yet
found occasion
to
take
up
the
matter
again.
I
do
not
want to be
presumptuous, considering
that the
issue involved
is
primarily
of
importance
to
Germans:
Nevertheless,
the
attitude of the
gentlemen
mentioned
gives
me
full confidence
that,
after
the
war,
something
will happen
in
the
direction
I wish.
With
cordial
greetings
from
both
of
us as
well
as
from de Haas and
my daugh-
ter,
and with best
wishes, devotedly yours,
H. A.
Lorentz.
316. From Friedrich Adler
Vienna,
1
Alser
St.,
23
March
1917
Dear friend
Einstein,
Your
letter
was a
welcome
joy,
above
all,
because it
proved
to
me
what
I
had
hoped
and
suspected,
that
our
earlier
personal
relations have remained
the
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