=Treatment.=—The osteopathic measures are aimed at the correction of the spinal lesions, especially those located in the upper dorsal and the cervical regions. Some reflex effects from lesions in more remote areas may have their influence so that it is wise to look to the correction of any other structural variations when present. Remarks by Dr. Hildreth The mental disorders of this type are purely functional and may cover a broad scope as to causes; however, from the osteopathic viewpoint a great majority of them seem to have as their specific exciting cause, lesions in the upper dorsal and upper cervical regions. The treatment should be applied specifically to the cause which may range anywhere from the 1st to the 8th dorsal, or from the 1st to the 3d cervical, covering the nutritional and circulatory centers and thus controlling the nutrition and circulation to the brain. There can be no question but what the osteopathic theory of adjustment of physical defects forms the basis of permanent cure, since many of our recoveries had been previously under other methods of treatment without results. Our records cover over 200 cases with recovery in more than two-thirds, and very few recurrences up to the present. Involutional Psychosis In the mid years of life, between forty and sixty, a decline begins, which in the older years results in decay; it is especially true at this period of the sexual life and the organs underlying it. While these organs undergo a very definite change constituting the so-called climacteric period in women, it is not at first sight so evident in men; however, the evidence is that a somewhat similar process, though much slower, tends to occur in the male. Associated with the decay of the sexual organs is a disturbance presumably of the internal secretions; if this latter disturbance takes place slowly and evenly the body may not notice any marked changes; on the other hand, if it takes place more quickly, or unevenly, it may give rise to distinct symptoms which indicate a disturbance of the nervous system in general and often even of the mentality. Hence, the significance of the term, Involutional Psychosis. In a large majority of cases the mental disorder is marked by the dominance of depression and is frequently referred to as melancholia. For a long time it was considered that this represented a special mental disorder having little or nothing in common with other psychoses. In recent times Dumas has studied this group very carefully and shown that it in reality has very much in common with the depressed phases of the Manic Depressive Group of psychoses. Kraepelin himself, who was the first to demonstrate the unity of the Manic Depressive Group, has accepted the conclusions of Dumas and incorporated the Involutional Depressions as a sub type of his Manic Depressive Psychosis. Among etiologic factors have been mentioned hereditary elements, which have been claimed to have been