This collection was entered by the psychological and psychiatric works of В. М. Бехтерева, sanctified to the questions of hypnosis, suggestion and psychology of the masses, telepathy. He investigated the origin of illusions and hallucinations, analysed, why the epidemics of religious character happen and from what стигматы appear on the bodies of true believing, the phenomenon of such leaders, as Жанна of д'Арк, Mahomet, Peter Great, Napoleon, explained, and why crowds followed after them, infected by a "psychical microbe".