=Case 24.= Michael O’Donnell, a laborer of 48 years, came home, one day, at 5:30, complaining of severe headache. His wife told him he should lie down and, taking him by the arm, tried to help him to the bed. At this moment, O’Donnell lost control of both left arm and left leg, and fell, unable to move but with consciousness preserved. The wife noted that the left side of his face was drawn up and that he drooled. He was at once carried to a general hospital, remaining there for about three weeks, talking at random in a delirious manner and tied in bed. Two intraspinous injections of salvarsan were given, and O’Donnell showed considerable improvement and went home. However, upon his return from the hospital, he became very wilful, would not remain in bed, and on one occasion actually took the mattress from the bed, carried it to another room, and then returned to his own room and slept upon the springs. He became irritable and emotional, insisted upon going to the hospital, did not go there but upon returning home insisted that he had been there. That night, O’Donnell left the house only partly dressed. It appears that O’Donnell had been excessively alcoholic, but that before August 15, when he sustained the left-sided hemiplegia above mentioned, there had been no symptoms except that in February he had once been very dizzy. It appears that there had been another dizzy spell, three nights before the paralysis, accompanied by a fall and unconsciousness for about 15 minutes. =TRANSIENT OR FLEETING PARALYSES= NEUROSYPHILIS MYASTHENIA GRAVIS MYOTONIA CONGENITA (THOMSEN’S DISEASE) PARAMYOTONIA CONGENITA MYOTONIA ATROPHICA INTERMITTENT CLAUDICATION OCCUPATION NEUROSES FAMILY PERIODIC PARALYSES ETANY EPILEPSY MINOR HYSTERIA MULTIPLE SCLEROSIS APOPLEXY CEREBRAL THROMBOSIS CHART 20 O’Donnell was brought to the Psychopathic Hospital some six weeks after the paralysis, complaining merely of a slight headache and desirous of treatment. There were no mental symptoms of any sort. =Physically=, O’Donnell was in general not abnormal (there was a slight pre-systolic murmur and a blood pressure of 190 mm. systolic). The pupils were slightly irregular, the left larger than the right; both reacted sluggishly. Both ears were moderately deaf; the tendon reflexes of the left arm and leg were somewhat more lively than those on the right. The systematic =neurological= examination otherwise revealed no abnormalities. The urine was negative. The serum W. R. was positive but the spinal fluid reaction was negative. There were but 2 cells per cmm., and there was a very slight trace of albumin.