The one chapter in which I have permitted myself any explanations is the Second of the Third Section "Theory." Here where the sole concern is the presentation of a most important part of the philosophy which I represent, my antagonist cannot complain if I put myself to some trouble to speak popularly and to generalise. This was undoubtedly a special occasion. I had made a French translation of three chapters of the book (the First of the Introduction and the First and Second of the Third Section) into a separate pamphlet for my friend Lafargue, and the French edition afterwards served as a basis for one in Italian and one in Polish. A German edition was provided under the title "The Development of Socialism from Utopia to Science." The latter has exhausted three editions in a few months and has also made its appearance translated into Russian and Danish. In all these publications only the chapter in question was added to and it would have been pedantic in me if I had confined myself to the actual wording of the original in the new edition in spite of the later and international form which it had assumed. Where I wished to make changes had particular reference to two points. In the first place with regard to primitive history, as far as known, to which Morgan was the first to give us the key in 1877. In my book "The Origin of the Family, Private Property and the State," Zurich, 1884, I have since had an opportunity of working up material more lately accessible which I employed in this later work. In the second place, as far as that portion which is concerned with theoretical science is concerned, the presentation of the subject is very defective and a much more definite one could now be given. If I did not allow myself the right of improving it now, I should be in duty bound to pass criticism on myself instead of the other.