On the (hydrodynamic) memory in the theory of Brownian motion

The aim of this paper is to remember and review several exceptional investigations on the theory of the Brownian motion. Although in these works the first correct hydrodynamic theories of the translational and rotational Brownian motion have been created, they remained unknown or very little known to the physical community and long time after the appearance of the original papers their main results were rediscovered by other authors. The reviewed works are highly interesting not only historically but from the methodical point of view as well.