The economic development of the United States has reached a point where the growth of the Socialist Party must henceforth go forward with startling rapidity. That the publication of this volume may have some effect in clarifying the ideas of those who discuss the principles of that party, whether with voice or pen, is the hope of the TRANSLATOR. ESSAYS ON THE MATERIALISTIC CONCEPTION OF HISTORY I. In Memory of the Communist Manifesto 7 II. Historical Materialism 93 ESSAYS on the Materialistic Conception of History PART I IN MEMORY OF THE COMMUNIST MANIFESTO. I. In three years we can celebrate our jubilee. The memorable date of the publication of the Communist Manifesto (February, 1848) marks our first unquestioned entrance into history. To that date are referred all our judgments and all our congratulations on the progress made by the proletariat in these last fifty years. That date marks the beginning of the new era. This is arising, or, rather, is separating itself from the present era, and is developing by a process peculiar to itself and thus in a way that is necessary and inevitable, whatever may be the vicissitudes and the successive phases which cannot yet be foreseen. All those in our ranks who have a desire or an occasion to possess a better understanding of their own work should bring to mind the causes and the moving forces which determined the genesis of the Manifesto, the circumstances under which it appeared on the eve of the Revolution which burst forth from Paris to Vienna, from Palermo to Berlin. Only in this way will it be possible for us to find in the present social form the explanation of the tendency toward socialism, thus showing by its present necessity the inevitability of its triumph. Is not that in fact the vital part of the Manifesto, its essence and its distinctive character?