Reviewing a series of sixty-five of my own cases of traumatic dislocations of the neck, seen during the last six years, I am impressed with the presence of systemic predisposing causes in a certain small group. From a mechanical point of view, the more obvious offenders are stairways and automobiles, constituting twenty-one cases, or one third of the total. As a toxic predisposition, of course alcoholism heads the list, being definitely present in six cases and presumably responsible in several more. Among destructive bone conditions, tuberculosis and osteo-arthritis of the cervical spine must be classified as direct causative factors and are not included in a study of traumatic dislocations. The possible existence of such lesions must be kept in mind. I have seen one dislocation of the cervical spine reduced, only to find by later developments that it was in reality an early case of cervical Pott's disease. <h3>DISLOCATION DURING</h3>