Thus, while I trust that my co-workers in the field of Arthurian research will accept these studies as a permanent contribution to the elucidation of the Grail problem, I would fain hope that those scholars who labour in a wider field, and to whose works I owe so much, may find in the results here set forth elements that may prove of real value in the study of the evolution of religious belief. J. L. W. Paris, October, 1919.