GYNÆCOLOGY AND OBSTETRICS

the personality, without intellectual impairment, psychosis or neurosis, with loss of insight or ability to profit by experience, and is of lifelong duration in about all cases. Professor Sir David Henderson (1950), who is the leading British exponent of this concept, states: We include under this title persons who have been from childhood or early youth habitually abnormal in their emotional reactions and conduct, but who do not reach, except episodically, a degree of abnormality amounting to certifiable insanity; they show no intellectual defect as measured by the usual intelligence tests and therefore cannot be classified in terms of the Mental Deficiency Act; and they do not benefit under prison treatment. He refers also to "rebellious, individualistic groups who fail to fit into their social milieu, and whose emotional instability is largely determined by a state of psychological immaturity which prevents them from adapting to reality and profiting from experience".