PREFACE.
xi
been in so high a degree a philosophy of deeds as the dialectical materialism. Not only upon research but upon deeds do we rely to show the superiority of our philosophy.
Even the book before us has not to serve for contemplative knowledge, but for the fight—a fight in which we have to develop the highest ethical strength as well as the greatest clearness of knowledge if we are to win.
K. Kautsky.
Berlin, Friednau, January, 1906.
