James lished under the title, The Varieties of Religious Experience (1902). It had been James's original intention to di- vide his attention equally between the psycho- logical and the philosophical aspects of religion. The author's liberal, varied human sympathies, his sensitiveness to the nuances of the emotional life, and that vividness of style and genius for citation which he had already exhibited in the Principles, resulted in a masterly exposition of conversion, saintliness, and other states charac- teristic of man's religious life. The book was not only widely read but gave a great impetus to further and more systematic research in the psychology of religion. Its chief significance, however, lay in those philosophical intimations and prospects which, though they had been con- fined to a small space, had by no means been crowded out. An empiricist looks for knowledge to experience, and there is an implication that the "religious experience" will be the source to which one should turn for religious knowledge. The central religious experience is the mystical state which claims to know God. James sup- ported this claim by the hypothesis of a sub- liminal self through which an individual may become aware of a sphere of life and a sustaining power beyond his normal consciousness. This is the religious datum, the further interpretation of which must be left to philosophy, guided by the "pragmatic" principle. Religious beliefs must be fruitful, and must be in agreement with man's moral and esthetic demands. The reli- gious hypothesis has, in other words, two types of proof, the proof by immediate experience and the proof by life. This distinction not only reaches back to James's original coupling of empiricism and voluntarism, but affords the best clue to his philosophical development after 1902. Seeking a final metaphysics, and hoping to write it down in a definitive and systematic form, he oscillated between these two methods: a deep- ening and broadening of the notion of experi- ence so as to provide an immediate apprehension of reality, and an elaboration of the practical and emotional demands which a true conception of reality must satisfy. The Varieties was one of the most widely pop- ular of James's works, and despite the fact that its primary intent'was scientific rather than de- votional it brought to many readers a confirma- tion or new assurance of religious faith. In the correspondence with friends, new and old, which followed the publication of the book, James's spoke candidly of the grounds and content of his own personal faith. God to him was a "pow- erful ally" of his ideals, and religion a belief James by which his "causes" received corroboration. As to the mystical experience, he was disposed to accept it not because of any such experience of his own, but rather because he felt "normal" or "sane" consciousness "to be so small a part of actual experience," and because he felt the cumulative force of the religious history of man- kind. On the whole the most important effect of the publication of the Varieties was to shift the emphasis in this field of study from the dog- mas and external forms of religion to the unique mental states associated with it; and to strength- en the opinion that there is a religious experi- ence sui generis, whose noetic claims deserve a respectful and sympathetic consideration. James's interest in abnormal experiences found expression not only in his study of reli- gion, but in two celebrated essays which ap- peared later. One of these on "The Energies of Men" (Philosophical Review, Jan. 1907) dealt with the unexpected reserves which human nature brings into play in emergencies; the other, entitled "The Moral Equivalent of War" (International Concilium, No. 27, Feb. 1910), discussed the possibility of devising some social measure, such as a universal conscription of youth for useful labor involving physical toil and hardship, by which the martial virtues and satisfactions could be secured without destruc- tion and without cruelty. In connection with these essays James collected a considerable amount of material which was apparently de- signed for a work on "the varieties of military experience." Between 1902 and 1907 James's health was so far restored as to permit of a great multipli- cation of his activities. His Harvard teaching was now limited to a single course but the time and strength which were saved were freely ex- pended upon incessant reading, lecturing, and writing, together with a voluminous correspond- ence. The honorary degree of LL.D. was be- stowed upon him by his own university in 1903, and he took this occasion to give memorable ex- pression to his idealization of Harvard ("The True Harvard," reprinted in Memories and Studies, 1911). In 1905 he attended the philo- sophical congress in Rome, and was made hap- pily aware of his growing fame. In January 1906 he made his second trip to California and became visiting professor for the second half of the academic year at Stanford University, where he gave the introductory lectures which he later revised and amplified, and which were published after his death, under the title of Some Problems of Philosophy. His enthusiasm for the young civilization of the Pacific coast was character- 597