380
DOCS. 511-513
MARCH 1914
yourself
that
you
would be
appeased
if I
didn't
go
to
Paris[1]
but
came
from Leiden
directly
to Berlin. So
that
is
what
I
am going
to
do,
and I
am coming
around the 1st
of
April
and-hallelujah-will be
alone there for about
14
days,
because
on
doctor's orders
my
+ must
go
with
the children
to
Locarno for
recuperation.[2]
I
am
tremendously
happy
and I know
that
I will
come
alive
there
again.
We
are
going
to
take
many walks;
I
almost
never
did
that here because
I
was
not able to
get
into
a good
mood.
I
also
think that
life
for Uncle Jakob
and
my
mother
will be
nice.[3]
Both
are
robust,
somewhat
raw,
and for
their
age
still
capable
of
enjoying
themselves.
Pardon
the harsh
expressions;
this
straightforwardness
comes
from
the
peculiarly
brain-racking
work
in
which I must
engage,
and
from
the
fact
that
my
life
rushes
by
in
a
way
so
incredibly
devoid
of charm
(+).
But
this
is
now
going
to
change,
and
you
will
see
that
my
woodenness
will also
soon
disappear.
Please
put up just
this
one
last
time with this
telegram.
Many
kisses from
your
Albert
512.
To
Paul Ehrenfest
[Zurich,
before
10
March
1914][1]
Dear
Ehrenfest,
I
am
eagerly
looking
forward
to
the
last
third of
March,
because
I
decided
to
indulge
myself
and
come
to
visit
you
in
Holland
at
that
time.[2]
The
work
on
gravitation
progresses,
but
at
the
cost
of
extraordinary efforts; gravitation
is
coy
and
unyielding!
The
equivalence principle is
valid
after
all in
the
sense
that there
exist
highly
general
transformations that
transform
the
gravitational equations
into
themselves.[8]
What
has
been found
is
simple,
but the search
is
hell!
Everything
else,
in
person.
Many greetings
to
you
and
your
wife from
your
Einstein
who
is
very
happy
that
he will
see
you soon.
I
am writing
simultaneously
to Lorentz.[4]
My
wife
sends
you
her kindest
regards.
She must
go
south
with
our
youngest,
who
was
quite
ill.[5]
513.
To
Heinrich
Zangger
[Zurich,]
10
March
[1914][1]
Dear
friend
Zangger,
Do
not
be
indignant
because of
my long
silence!
I
was toiling
again
on
the
gravitation theory
to
the
point
of
exhaustion,
but
this time with
unheard-of
success.
That