may appear at a very early age. Persons with artistic tendencies develop in this way with comparative frequency. We must, for these reasons, guard against the misconception that the early awakening of sexuality is _per se_ pathological. The fact that the study of the sexual life has been undertaken chiefly by medical men, and above all by neurologists and alienists, has inevitably introduced a certain bias into the results of the investigation. Opportunities for the study of the sexual life of normal persons have been comparatively rare; for those in whom the early awakening of sexuality has been recorded have for the most part sought medical advice and treatment for some other reason, and the physician has taken the opportunity to make inquiries into the patient's sexual history. The boundary-line between what is pathological and what is normal can be determined only by an extended study of the sexual life in normal persons. By very numerous inquiries I have done my best to effect this; and a careful examination of the accumulated material leads to the above-mentioned conclusion, that an early awakening of the sexual life is commoner in those with an abnormal nervous system than it is in healthy persons: but it also appears that an abnormal sensitiveness of a non-pathological character, such as is exhibited by persons with the artistic temperament, and likewise a disposition excitable to a degree which cannot yet be called morbid, predispose the subjects to an early awakening of sexuality.