_Importance of the subject—Its Divisions. First Period: origin of the religious feeling—Primitive notions of the Infinite (Max Müller); Ancestor-worship (H. Spencer)—Fetichism, animism; Predominance of fear—Practical, utilitarian, social, but not moral character—Second period: (1) Intellectual evolution; Conception of a Cosmic Order first physical, then moral—Function of increasing generalisation; its stages; (2) Emotional evolution; Predominance of love; addition of the moral sentiment—Third Period: Supremacy of the rational element; Transformation into religious philosophy; Effacement of the emotional element—Religious emotion is a complete emotion—Manifold physiological states accompanying it; ritual, a special form of the expression of emotion—The religious sentiment as a passion—Pathology—Depressive forms: religious melancholy, demonomania—Exalted forms: ecstasy, theomania._ It must be confessed that psychologists have not troubled themselves greatly with the study of the religious sentiment. Some omit it altogether, while others content themselves with a brief reference in passing; they note the two essential elements whence it is derived—fear, and tender emotion (love)—without troubling themselves about the variable relations between these two elements, or the multiform changes undergone by them in the course of centuries, through the annexation of other emotional states.[188] As we cannot deny its importance, this abstention, or negligence, is not justifiable. To summon to our aid an ill-understood respect, to maintain that one religion only is true and all the others false, to allege that all are alike false,—these and other analogous modes of reasoning are not in any degree acceptable to psychology; for, even if we take up an extreme position, and admit that all manifestations of the religious sentiment are mere illusion and error, it remains none the less true that illusion and error are psychic states, and worthy of being studied as such by psychologists. To such, the religious sentiment is _a fact_ which they have simply to analyse and to follow through its transformations without being competent to discuss its objective value or its legitimacy. Thus understood, the question bears on two principal points: primary manifestations and their evolution, _i.e._, the different elements which have constituted the religious sentiment during the various stages of its existence. ----- Footnote 188: Since the above was written two lengthy and valuable studies of the psychology of religion, and more especially of the phenomena of “conversion,” have been published by Leuba and Starbuck, largely inspired by Prof. Stanley Hall (_Am. Jour. Psych._, 1896-97). Both these studies are founded on original data, in part obtained by a _questionnaire_.—ED. -----