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The moral sense constitutes the ability to maintain a more or less proper relation between the social and egotistical tendencies. The social instinct originated, in point of time, little later than the egotistical. In adult life when the herd instinct fails to develop, it becomes perverted as in the case of the sexual instinct. Rees Thomas cannot therefore subscribe to the view that the patient has no moral sense, as this term refers to the resultant of numerous forces and does not explain causation. Having paid tribute to Freud's researches, he emphasizes the fact that a great number of cases of anti-social conduct can be cured by psycho-analysis. For practical purposes cases are classified as curable and incurable. The only certain permanent mental defect discovered is the presence of a psychosis or psychoneurosis. He agrees with Burt's classification of intellectual and temperamental types. General emotional instability existing apart from acquired mental disorders has not been found associated with normal intelligence in the cases at Rampton. As Burt finds, the presence of high intelligence in a temperamental defective must be extremely rare. To Burt's two classes he would add a third, in which acquired psychoses or neuro-psychoses constitute the permanent mental defect.