DOCS.
361-363
FEBRUARY
1912 265
and
also
for
reasons
of
a more
human
nature, the
position
will
remain
vacant
during
the
summer.
362.
From Emil
Warburg
Charlottenburg 2
[Berlin],
Marchstrasse
25b, 19
February 1912
Highly
esteemed
Colleague:
Thank
you very
much for
your
letter of
10 February,
from which
I
am very
pleased
to
see
that
you
intend
to
come
to
Berlin
at
the
beginning
of
March.[1]
It
would be
a
great
pleasure
for
my wife[2]
and
me
if
you stayed
with
us.
You would be
totally
free
to
pursue
your own
affairs,
since
everyone
in
our
household
also has his
own
pursuits;
the
connection
with
the
city,
via
the
nearby
subway,
is
very
convenient.
May
I
only
ask
that
you
let
me
know in time
whether
and
when
we
should
expect you
(Marchstrasse 25b,
Charlottenburg).
An
experimental
answer
to the
question
you
broached
would
probably
be
possible;
more
about
it in
person.
The
main
question
for
the
application
of
your
law
is
always
in
what does
the
elementary photochemical
process
consist.-
In
any case,
this
opens
a
wide
&
I
believe, rewarding
field
for
experimental
investigation;
I
am
already planning
many
experiments.[3]
With
highest regards,
and in
the
expectation
of
a
positive
answer, I
remain
yours
truly,
E.
Warburg
363. From
Ludwig
Hopf
Aachen,
Lousbergstrasse
72,
20
February
1912
Dear
Mr. Einstein,
For
quite
a
while I have
had
it
in mind to inflict
another
epistle
on you,
not in
order
to
report great
news,
but
only
to show
you
how much
I
think about
you
and
your
dear
ones.
Today
I
am
sending,
first
of
all, my
congratulations
on
the
final
offer
you
received
from
Zurich.[1]
It
surely
will not be
too
hard
for
you
to
say goodbye
to
Prague.
Or
have
you grown
fond
of
it in
the meantime?
Things are
quite
nice
and
pleasant
here;
that the
social
life
is not
exciting,
you
can
already
see
from
the
fact
that
I sit at
home and
write
on
Shrove
Tuesday.
But
from
a
scientific
point
of
view
things
are
interesting.
Hydrodynamics
is
far
more
exciting
these
days
than
one
would have
thought;
there
are many
fundamental
questions
on
the
agenda;
one
wants to know
what
really goes
on
in solid
bodies,
and what
goes
on seems
to
be
very
remarkable.
Recently
Kärmän
achieved
a
great triumph
in
that he calculated
a