172
DOCS.
244,
245
JANUARY 1911
244. To
Jean Perrin
Zurich, 12 January 1911
Highly
esteemed
Sir:
Thank
you very
much for
having
checked the
relation
77
=
?70(1
+
(p).[1]
You
are no
doubt
acquainted
with Mr. Bacelin's
report
to
me
and
my answer
to
him. A
friend
of
mine,
Dr.
Hopf,
has
now
repeated
my calculations,[2]
and he
indeed found
a
mathemati-
cal
error.
In
my
calculation of the
components
of
the
pressure
Xv
&
Xe
at
the end
of
§1
of the
paper,
I
differentiated the
expressions
for
u,
v, w incorrectly.[3]
Correcting
this
error,
one
obtains
rj
=
77(1
+
2.5tp).
True,
the
discrepancy
between the
experiments
of
Mr.
Bacelin and
the
theory
is
now no
longer
so
great.
But
now
it
is
practically
certain that
the
theory
does
not
contain
any
further
errors,
so
that
I must
consider
it
probable
that there
is
an error
somewhere
in
the
experiment
as
well.
Might
it not be
possible
that
your
mastic
particles
are,
after the
3.9
fashion
of
colloids,
in
a
swollen
state? The
influence
of
such
a
swelling
-:-
would be
2.5
of
rather
little
influence
on
Brownian
motion,
so
that
you might
well have missed
it. But,
of
course, I
do not want
to
make
any
assertion about
that.[4]
Respectfully
yours,
A.
Einstein
245.
From
Count Karl
von
Stürgkh
Vienna, 13 January 1911
No. 842
To
His
Honor,
Extraordinary
Professor
at
the
University
etc.
in Zurich, Dr.
Albert
Einstein
By
the
supreme
decree of
6
January 1911,
His
Imperial
and
Royal-Apostolic Majesty
has most
graciously
appointed
you
Ordinary
Professor of Theoretical
Physics
at the
German
University
in
Prague
with
the
prescribed
emoluments
and effective
as
of
1
April
1911.[1]
This
is to
inform
you
of this
supreme
decree,
with the
request
that
you present
yourself to
the
viceroy
of
Bohemia[2]
at
the
time
your
appointment
becomes
effective in
order
to
be
sworn
in,
that
you
start
your
new
teaching post
at
the German
University
in
Prague at
the
beginning
of the
summer
semester
1911,[3]
and
that
in due time
you
reach
an
understanding
with the
dean's
office
of
the
Philosophical Faculty
in
Prague regarding
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