To insist upon its importance is to obscure, as has been obscured, the epic range of Mr. Cabell's creative genius. It is to fail to observe that he has treated in his many books every mainspring of human action and that his themes have been the cardinal dreams and impulses which have in them heroic qualities. Each separate volume has a unity and harmony of a complete and separate life, for the excellent reason that with the consummate skill of an artist he is concerned exclusively in each book with one definite heroic impulse and its frustrations.