[Footnote K: Hypnotism and its Application to Medicine. By Otto Georg Wetterstrand, M. D. Authorized translation (from the German edition), by Henrik G. Petersen, M. D. Together with Medical Letters on Hypno-Suggestion, etc. By Henrik G. Petersen, M. D. New York: G. P. Putnam's Sons. Pp. 166.] The original object of Mr. _Henry Rutgers Marshall's_ essay on _Instinct and Reason_[L] was to present a conception of religion. In attempting to make his argument convincing he found it necessary to deal with questions which did not at first appear to relate to this subject, whereby the study of religion, though still the most important and interesting matter considered, is made to appear subsidiary to the treatment of instinct and reason. Believing that activities so universal in man as those which express his religious life must be significant in relation to his biological development, the author has attempted to outline a theory that will account for their existence and explain their biological import. In order to present this clearly he has made a special study of instinct and the relation of its activities with religious activities in general. This has naturally led to the study of impulse, and thus to a consideration of moral standards. The study of reason, too, has been found appropriate in connection with the consideration of the nature of religion. The genesis of religious customs and beliefs is touched upon only so far as seems necessary for the elucidation of other parts of the treatise. Concerning the relation of religion and morals, the author finds that religion teaches us to listen to the past, and gives enthusiasm to do the work commended by the "voice" of that past; it gives us the basis for the perfection of our moral code, but it does not give us this perfect moral code itself. When reason and the religious instinct are opposed we should, after reverent and full consideration, act in accord with reason, but should be cautious in guiding others that way, for the chances are decidedly that we are wrong, and "the rule of action which will best satisfy conscience, which will produce the closest correspondence between our action as viewed in retrospect and our most permanently efficient impulse series, is one which is based upon the religious instinct, and which involves the presence in mind of the sense of duty." [Footnote L: Instinct and Reason. An Essay concerning the Relation of Instinct to Reason, with some Special Study of the Nature of Religion. By Henry Rutgers Marshall. New York: The Macmillan Company. Pp. 574. Price, $3.50.]