In this paper it will be shown that according
to the molecular-kinetic theory of heat, bodies
of microscopically-visible size in a
liquid will perform movements of such magnitude
that they can be easily observed in a microscope,
on account of the molecular motions of heat.
It is possible that the movements to be discussed
here are identical with the so-called Brownian
molecular motion however, the information
available to me regarding the latter is so lacking
in precision, that I can form no judgment in the
matter。