Practically coincident with the appearance of these earliest studies, however, was a radically different use of the term 'folk psychology.' The mental sciences began to realize the need of a psychological basis; where a serviceable psychology did not exist, they felt it necessary to establish an independent psychological foundation for their work. It was particularly in connection with the problems of philology and mythology, and at about the middle of the century, that the idea gradually arose of combining into a unified whole the various results concerning the mental development of man as severally viewed by language, religion, and custom. A philosopher and a philologist, Lazarus and Steinthal, may claim credit for the service of having introduced the term 'folk psychology' to designate this new field of knowledge. All phenomena with which mental sciences deal are, indeed, creations of the social community. Language, for example, is not the accidental discovery of an individual; it is the product of peoples, and, generally speaking, there are as many different languages as there are originally distinct peoples. The same is true of the beginnings of art, of mythology, and of custom. The natural religions, as they were at one time called, such as the religions of Greece, Rome, and the Germanic peoples, are, in truth, folk religions; each of them is the possession of a folk community, not, of course, in all details, but in general outline. To us this fact has come to appear somewhat strange, because in our age these universal mental creations have already long transcended the limits of a single people. Though this is true, it does not imply that the folk community is not really the original source of these mental creations. Now, in the works of Lazarus and Steinthal and in the _Zeitschrift für Völkerpsychologie und Sprachwissenschaft_ edited by them and appearing in twenty volumes from 1860 on, the conception had not as yet, it is true, received the precise definition that we must give it to-day. Nevertheless, a beginning was made, and the new venture was successfully launched along several different lines. Some uncertainty still prevailed, especially with regard to the relation of these studies to philosophy, and as to the method which psychology must follow when thus carried over into a new field. It was only gradually, as the psychological point of view gained ground in the special fields of research, that this condition was improved. To-day, doubtless, folk psychology may be regarded as a branch of psychology concerning whose justification and problem there can no longer be dispute. Its problem relates to those mental products which are created by a community of human life and are, therefore, inexplicable in terms merely of individual consciousness, since they presuppose the reciprocal action of many. This will be for us the criterion of that which belongs to the consideration of folk psychology. A language can