134
MOVEMENT
OF SMALL
PARTICLES
Ax
=
8.10-5
cm
=
0.8
micron.
Thus,
the
mean
displacement
in
1
min.
would
be about
6
microns.
Conversely,
the relation
found
can
be used
for the determination of
N.
We
obtain
AT
_
t
RT
N
-
-
X
Let
us
hope
that
a
researcher will
soon
succeed
in
solving
the
problem
[23]
posed
here,
which
is of
such importance
in the
theory
of
heat!
Bern,
May
1905. (Received
on
11
May
1905)