In offering this book to the public, we have to say that we thought it useless to go over the ground covered by so many treatises on Socialism, large and small, hostile and friendly, that have appeared of late years. We have dealt with our subject from the historical point of view ; this, we are aware, is a less exciting method than the building up of "practical" Utopias, or than attempting the solution of political problems within the immediate purview of the Socialist struggle of to day. On the other hand, a treatise on abstract economics, furnished with a complete apparatus of statistics, would have been more congenial to another class of mind. Nevertheless, a continuous sketch of the development of history in relation to Socialism, even as slight as it is here, should have its value if efficiently done. Our plan also necessarily deals with the aspirations of Socialists now living, toward the society of the future.

We have only further to add that the work has been in the true sense of the word a collaboration, each sentence having been carefully considered by both the authors in common, although now one, now the other, has had more to do with initial suggestions in different portions of the work.