more fully than any other work of Marxism with such problems and categories of dialectics such as causality, chance (freedom) and necessity, relationship of induction and deduction, and many more. Even though unfinished, this outstanding work is amazing for its rich and profound theoretical content. Despite certain aspects being obsolete, notably some factual data and timescales, resulting from the prevailing state of natural science at that time, the general method and conception of the book remain valid today. The book also contains Engels' brilliant essay, The Part Played by Labour in the Transition from Ape to Man, which explains how and by what means our species originated. It has been described by Richard Levins and Richard Lewontin as capturing "the essential feature of human evolution."