The publication proposed to the reader is composed by a textbook combination of various sources related to the topic of the dialectic of natural science, which include: first, all handwritten notes and fragments, and more or less finished articles written by the author (F. Engels) and attributed by him to the "Dialectic of Nature," secondly, excerpts from other works of the author, both published by him during his lifetime and remaining in the manuscript, for example, in the form of preparatory and draft materials (we are talking about fragments taken by the compiler from Anti-Düring, from Ludwig Feuerbach... and other works of the author, from his letters to Marx and other addressees);