The average student of any historical period invariably reads into his interpretation the intellectual, moral and social atmosphere that lies nearest to him. He cannot strip away the intervening time-content between himself and the period in question. It is the most difficult of all exercises of the imagination, and to most men, indeed, impossible, to realize that the same words, names, customs and institutions connote totally different actualities in different stages of historic evolution. People fail to conjure up the altered perspective, and the unfamiliar background on which men lived, thought and felt in another age.