A Quarter of a century has passed since the western world acquired and developed some familiarity with Russian philosophy. The names of Chaadayev, Kireyevsky, Khomiakov and Solovyov are not unknown. The success of the late lamented Nicolas Berdyaev, not only in Europe but also in America and even in the far East, was in large measure due to the fact that his thought continued the tradition created by his Russian predecessors. Ontology, irrationalism, personalism, theohuman nostalgia—such are the themes and attitudes in which lies the originality of this current of ideas.