The eighteenth volume of the Collected Works of V. I. Lenin contains the work "Materialism and Empirio-criticism," which was written from February to October of 1908 and published as a separate book in May 1909.

"Materialism and Empirio-criticism" is the principal philosophical work of V. I. Lenin. Its historical significance lies in its further development of Marxist philosophy, responding to the fundamental philosophical problems that confronted the party at that time, and providing a philosophical generalization of the latest achievements in the natural sciences.

The work "Materialism and Empirio-criticism" is a model of Bolshevik partisanship in the struggle against the enemies of Marxism. In this work, fiery revolutionary spirit and profound scientific rigor are organically united.

[Excerpt from the text of the preface]