=Circulation= is rarely good, causing blueness and coldness of extremities, with sores and chilblains. Heart lesions are frequent. Lesions of a chronic inflammatory nature in respiratory and digestive tracts exist. Nasal and bronchial catarrh and diarrhea are common. Mongols die early (about 14 years) usually of phthisis. Available statistics show the various types and variations of these conditions in great detail; however, the above will enable the reader to classify and properly diagnose in given cases. It is not the writer’s intention to portray here what is easily a treatise by itself. =Osteopathic Consideration of Amentia.=—During a period of five years, observation of the various types has led me to believe that much can be done to correct circulation to cerebral structure with consequent development of brain tissue and function, where discoverable trauma exists. From all available sources there is traumatic interference in from 15 to 45% of these cases, according to different authors. Where history involves constitutional findings (syphilis, tubercular, glandular and chronic alcoholism) I have treated them with the intent of relieving only until the next phase of the condition would appear. Where trauma alone exists and the family history is good, I know the case is in the field of osteopathy alone, and can be developed to a degree limited only by the intelligent care of those having the case in charge. Especial attention should be given to discipline, housing, sanitation, personal hygiene and general environment. =Lesions.=—Atlas, generally rotated. Rarely posterior but frequently resting beneath a posterior occiput. Lateral mass on the posteriorly resting portion of misplaced atlas will become interlocked with transverse process of axis in a few instances, combining the amentia with a progressive inflammatory tendency to the middle ear which by successive abscesses ultimately destroys structure and function; possibly traumatic epilepsy, and surely catarrhal inflammations in all mucous membranes of the head. Many bony and ligamentous irregularities exist in the various types of mental defective where the cause is inherited weakness, nutritional diseases or kindred sources. Spinal luxations exist singly and in series, causing various palsies, spastic muscles, and deformity. Postural defects, particularly of ribs and costal cartilages cause functional disturbance throughout the thorax and abdomen. =Treatment.=—Invariably the care of aments entails wisdom of procedure. Reconstruction is the prime object in every instance, hence time and number of treatments must not be considered. Treat to =correct structure; teach= as far as possible; =train= always.