It must not be supposed that the foregoing is in the least irrelevant to the subject of the present work. Foerster firmly maintains that the sex question cannot be considered apart from life as a whole and without reference to our fundamental convictions. Sex is one of the essential facts of life, and cannot possibly be dealt with as a thing standing by itself. The earlier portions of this work are therefore de voted to laying the general foundations upon which the author bases his following treatment of the special problems of marriage, sexual education, and so forth.