In my preface to "The Middle Period" I wrote that the re-establishment of a real national brotherhood between the North and the South could be attained only on the basis of a sincere and genuine acknowledgment by the South that secession was an error as well as a failure. I come now to supplement this contention with the proposition that a corresponding acknowledgment on the part of the North in regard to Reconstruction between 1866 and 1876 is equally necessary. In making this demand, I must no