An infantryman, observed at Villejuif, February 9, 1915, was suffering from a right-sided crural monoplegia of a pseudocoxalgic type, following a wound September 9, 1914. The wound had been a through-and-through one in the upper right thigh. Every active movement could be performed as well on the right side as on the left; but the strength of the movements was less on the right, especially that of leg-extension. The reflexes were normal, the lameness was slight, with toeing out; the sole came down flat upon the ground. There was an absolutely complete anesthesia of the entire right leg and side up to the umbilicus. Energetic faradization of the skin caused the anesthesia to disappear the day the patient was brought to the hospital. The cure of the lameness required a month of reëducation and electricity. According to Roussy and Lhermitte, crural monoplegia is less frequent than brachial monoplegia. The flaccid form is rare, and when it occurs, complete, though the patient always remains capable of executing some voluntary movements and can walk with crutches or cane. During the automatic movements of walking, some muscles may be observed to contract that remain immobile when the patient is being examined recumbent. Naturally such a difference in contractions standing and lying, would be very exceptional in a case of organic monoplegia. Contusion of thigh: HYSTERICAL right crural MONOPLEGIA. An ORGANIC CRUTCH PARALYSIS develops in the right arm, unobserved by the patient whose main concern is his useless leg. Cure of leg by psychotherapy. =Case 231.= (BABINSKI, 1917.) A certain lieutenant, following contusion of the right thigh, developed a crural monoplegia of hysterical nature. In fact, although the paralysis had lasted several months, the tendon reflexes, the skin reflexes, and the electrical responses of the muscles, were absolutely normal. Moreover, the good effects of psychotherapy confirmed the hypothesis. But besides the hysterical crural monoplegia, there was a radial paralysis on the right side, clearly organic in nature, due to the nerve compression by the crutch which the patient had employed on account of the paralysis of his leg.