ON July 21, 1910, we published a brief article entitled The Pro gram and First Platform of Six Realists,' 1 in which we indicated the direction philosophical inquiry ought to take. We there asserted that advance would be facilitated by cooperative investigations; and the drafting of the platform was a first attempt to confirm this belief. The present volume continues, on a larger scale, the work there inaugurated; and we hope it will be followed by other col lections of studies. The introductory essay voices our common opinions. The other essays do so only in part. It has seemed best to publish them with out laboring for complete unanimity, inasmuch as their agreements quite overshadow their differences. They have been written after prolonged conferences. A few important debatable topics are brie?y discussed by dissenting members in the Appendix.