120
DOCS.
107,
108 AUGUST
1915
107. To
Wander
and
Geertruida
de Haas
[Berlin,]
Saturday, 14 August
[1915]
Dear
Friends,
The
things
are already
loaded.[1]
The
landlord caused
no problems
at all.
Only
the
export
license from
the
Imperial
Office
of
the Interior
is
still
missing.
The
entire
move
will
come
to
about
350
M,
at most
400
M.[2] Shortly
after the
20th
of
this month the
things ought
to arrive in
Deventer.[3]
Then
you
can
pay
the
freight immediately.
I
shall inform
you
of
my
disbursements when
everything
is
finished. Should
I
ever
get
into
the
position
of
declaring my
love to someone, I
would
say
to
the
person:
“For
you
I
would
arrange a move
abroad
in wartime.”
Warm
greetings
to
you
both,
yours,
A.
Einstein.
I
am looking
forward to
the
results of
your experiments.[4]
108. To Paul
Hertz
Berlin,
Saturday
[between
14
August
and
9
October
1915][1]
Dear Mr.
Hertz,[2]
If
I understand
your
letter
correctly, you
have
a
completely
inappropriate
notion of what I
call
an
“adapted
coordinate
system.”[3]
How
do
you
come
to
requiring
that
such
a
pair of
coordinate systems-and added to
that,
with
con-
gruency
at
the
region’s
boundary-should
exist;
that for
ux
=
u
vx
=
v
also
Ex
=
E
Fx
=
F
Gx = G
px
=
p?[4]
I
am
rather
convinced
that
(aside
from
very special
cases
perh[aps])
this could
never
be possible.
Nowhere have
I
assumed
the
existence
of
systems equivalent
in
this
sense.