This is an unven compilation of papers on the topic of materialism. The first chapter, by Suchting, is a great commentary on the Theses on Feuerbach. Chapters 3, by Soper and 4, by Benton, have good discussions on the relationship between Marxism and biology. Benton, in particular, has a refreshing view on the work of Engels. The chapters of Collier and Hellman, on the other hand, were not so good.