368
DOC. 490
DECEMBER
1913
Wd(ü
=
Kd(ü
'
e
4tt
If
one
puts
-
=
x
and
if the
exponent is
written
as
-T$(x),
the
average energy
becomes[7]
!xV
Tp
(x) dx
OO
je'T^(x)dx
o
Differentiation
with
respect
to
T
yields
the
specific
heat.
As
far
as
I
can
tell, though,
the
curve
representing
this
as a
function of
T has
a
vertical
tangent
for T
=
0,
while
Eucken's
measurements
of
the
specific
heat of
hydrogen
require
this
tangent
to be
horizontal.[8]
This
is
the result
which,
of
course,
I
would have liked
to
be different.-
We
have
not spoken
much
about the
theory
of
gravitation,
but
I
think that
will
gradually
have its
turn.
Einstein mentioned
his
plan
to
travel
to
Haarlem
in
order
to
hear
your
opinion
and
criticism
of
his
theory,
which would be
very
important
to him. This
would
occur
next
spring
after
he arrives in
Berlin[9]
when
his time will be all his
own.
With Dr.
Stern[10]
I
get along
well. With the
other
physicists,
for that
matter, I will
also
get along
fine,
I think. I
try
to
keep
working,
sometimes
successfully,
other
times not.
There
are
many
books
on
the table
in
front
of
me,
which
I
definitely
want to
work
through,
but
which
are
still
waiting.
Time
passes quickly!
It
is
almost
Christmas
already!
I
hope
that
all
is
well
and
good
in
Haarlem
and
that
you
and Mevrouw and
Ru[11]
are
well. Will
you give
them
my
sincere
regards?
But
now
I
will
not
take
up any
more
of
your
time.
Signing
with
respectful regards,
yours
as
ever
A. D.
Fokker
*This translation
from
the Dutch
was
taken
directly
from
the
documentary
edition.
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