The addition of even a Single page to the voluminous criticism of the Grail Legend and the Divine Comedy can be justified only by the hope Of suggesting a fresh interpreta tion in the light of hitherto unnoticed facts. But they have been examined from so many different points of view that it would seem impossible to find any line of thought explanatory of questions in either, much less one which clears up problems in both. Nevertheless such a line of thought is, I believe, to be found in the history of the doctrine of transubstantiation.