DOCS.
515,
516
MARCH
1914 383
515.
To
Paul Ehrenfest
[Zurich,
19
March
1914]
Dear
E.,
I
am
tremendously happy
about
my
forthcoming
visit to
you.[1]
Thank
you very
much
for
your
letter.
I
will
arrive
at
your
place
Sunday
around
noon.[2]
I will
travel
in
the
company
of
Fokker[3]
(a
first-rate
fellow!)
Greetings,
also to wife and
children,
from
your
Einstein
Unfortunately,
I
cannot
bring
Albert
with
me.
My
wife will not
hand him
over
for
such
a long
time.[4]
516.
From Michele
Besso
Gorizia,
20 March 1914
Dear
Albert,
I
thank both of
you
for
your
kind
letter[1]
and for
inviting
me
to Berlin. I
hope
that
your
littlest
one
will
soon
have recovered
completely
from his
long
illness.[2]
It
certainly
is
going
to
be
very interesting
in
Berlin;
it
is
very possible
that
I
may come
to
visit
you
in
the
fall.
using library
materials,
while
there,
in
continuance of
my
socio that
I also
[.....]
from the libraries there
for
my
logical
studies.[3]
Your
extremely interesting result[4]
gave
me
great pleasure.
You had
already
realized,
in
principle,
that the conservation
laws
represent
the condition
for
setting up
an
admissible coordinate
system;[5]
but
it did
not
seem
to
be
out
of the
question
that the
restriction
to
the
Lorentz transformations
is
thereby
already
given, so
that
nothing
of
great
epistemological
interest
has
emerged
from
it.
Now
everything
is perfectly
satisfactory,
in
principle!
Does the result obtained
also
give a
clue, perhaps,
for
a
more
complete
treatment
of
the
rotation
problem,
so
that
one can get
the
correct value
of
the
centrifugal
force?
Unfortunately,
my
brain,
at
least the
way
it has
been
trained, is
much
too
feeble for
me
to
answer
this
question
myself, or even
to
guess
from
what
side it could
be
attacked. For
reasons
already
discussed,
it
seems
to
me
that
it
(?) is
of
importance
for the
astronomical
problem
as
well
(for
until
now
it at
least seemed that
a
system
in
which
no
Coriolis forces flit
about
could still be
a
seat
of
centrifugal forces,
or
the
reverse).
Now,
then, has
come
the turn
of
the
quanta!
But
for
the
time
being,
you
should
give
in to
your
need
for rest!
Cordial
greetings
from
us
all!
Your
Michele
I
am
writing
to
Mileva
directly;
still if
you
write
to
her,[6]
do
give
her
our
best
regards.