236 DOC.
16
MOVEMENT OF SMALL
PARTICLES
[21]
The value for the
viscosity
of
water
is
taken from Einstein
1905j
(Doc. 15),
p.
21. It
actually
refers to
water at
temperature
9.5°C.
[22]
The
size
of
the
particles
for which Einstein
performed
this calculation
is
also mentioned in
his letter to Conrad Habicht
of
18 May-8
June
1905;
it
approximately corresponds
to
the size
of
the
largest particles
studied
by
Felix Exner in his
experiments
on
Brownian
motion; see
Exner
1900,
p.
845.
[23]
For
a
discussion
of
subsequent experimen-
tal verifications
of Einstein's
results, see
the ed-
itorial
note,
"Einstein
on
Brownian
Motion,"
§
VII,
pp.
219-222;
see
also
Fürth
1922,
pp.
63-64,
fn. 13.