A Russian Captain, 45 (heredity good; non-alcoholic, non-syphilitic; always in good health) sustained shell-shock in a battle in southeastern Prussia, August 13, 1914, and was unconscious for two days. He was carried to one of the provisional field hospitals, and then evacuated to Petrograd, where during a period of four months, he was given electricity, suggestion, and baths. He was feeling so much better in December, 1914, that he went back to the front and headed his company in the trenches. He stood only five days of trench work, and was sent for mental examination December 29, 1914. The captain was of middle height, well developed but poorly nourished, of a dejected and preoccupied appearance, looking to one side in conversation, and finding difficulty in the expression of his thoughts. He talked almost exclusively of his illness. He found difficulty in adding or subtracting 2-digit figures. He seemed to have amentia, frequently being mistaken as to the most important dates in his life. He complained of general weakness and inability to work. Any endeavor to concentrate caused vertigo, irritation, and pains in the head. Day and night he was troubled about his health, his future, and his family’s future. He was going to become an invalid and a burden. He was tormented with the idea that people thought him a simulator. He complained of lumbar pains. It seems that the explosion had affected the left side of the body more than the right and he complained more of pains upon that side. In the dark his gait was unsteady, and he often had marked tremors of feet and hands. In excitement the tremor would increase uncontrollably. The patient thought that his hearing was diminished, especially upon the left side, and that his left ear was weaker than the right. He slept poorly and had many nightmares; his appetite was poor, and he was constipated. There was difficulty in respiration; the pupils were slightly dilated and sluggish in their responses. There was a marked tendency to Rombergism; dermatographia marked; the skull and especially the lumbar spine was painful on tapping; hyperesthesia of the lumbar skin; paresis of left hand and left foot. The tendon reflexes were more marked on the right side than on the left, and there was even a slight ankle and patellar clonus. The Babinski sign was present on the right side. There were frequent fibrillary contractions of the muscles of the trunk and back. Objectively the hearing was somewhat decreased in the left ear, and the vision of the left eye appeared to be somewhat impaired also. If the eyes had been held closed for a time, there was difficulty in opening them quickly. Aside from a somewhat elevated pulse and slight cardiac arrhythmia, there was no disorder of the internal organs. This patient remarkably improved but was not absolutely well at the date of the report.