DOCS.
270,
271
JUNE-JULY
1911
193
V Ū
/00
F
T\
v
=0
V
p
V
\
dv
v
0
V
/
0
where
(p
is
a
universal function that
is
very
difficult to
determine
analytically.
Your
formula
is produced
if
one
chooses
(p
in
the
following way,
P
A
m
ui
j\
A
i
2
V
V0
1
But in
reality
this will
not obtain;
instead,
frequencies
other than
v0
and
-
will also
appear.
But
one
should be satisfied if
one can
manage
with
your simple
schemat-
ization.[7]
Finally,
let
me
note
that
it would be
of the
greatest
interest
if
the thermal
con-
ductivity
of
simple
insulators that
behave
normally
with
regard
to
specific
heat
(e.g., KCl)
would be
investigated
for thermal
conductivity
at
the
lowest
temperatures.
For
I
deduce
from
the
quantum
hypothesis
with
certainty
that
the coefficient
of thermal
conductivity
must drop again
at
the
lowest
temperatures,
that,
in
fact,
it
must
drop exponentially
to
zero.[8]
If
this
does
not
prove
to be the
case,
then the
quantum hypothesis
has
to be
abandoned,
in
my
opinion.
I will
append
this
to
my
latest
paper
as a
supplement
added
in
proof.
The
explanation is
a
little too
lengthy
to be
presented
here.
With
highest regards,
your very
devoted
A.
Einstein
271. To
Lucien
Chavan
[Prague,
5-6
July
1911][1]
Dear
Mr. Chavan:
About
a
month
ago
Mr.
Zangger
went
to
see
Forrer and
apprised
him
of the
deplorable
state
of
affairs in the
Technical
Department.[2]
It
so
happened
that
a
representative
of
the Bell Co.
was present
who
annoyed
Forrer
very
much
by
his
insolent
conduct.[3]
Also,
a
complaint against Redding
was on
Forrer's
desk;[4]
he
just
has
to
have
a
quarrel
with
somebody.
Forrer
promised
to examine
everything
and to
keep
a
close