This study of retrograde amnesia of brief duration is based upon information furnished by 117 persons who had undergone, according to their statements, one or more terrifying incidents. All were men on full military duty, with the exception of three civilians, included as being of particular interest. In many investigations the information has been obtained from patients in whom motives other than accuracy could have taken a part in their descriptions. A patient may invent, distort or exaggerate his amnesia for psychological, or material and pecuniary, aggrandisement. In this series 99 of the cases were voluntary applicants for officer-training.