The psycho-neuroses, that is, the various perversions of nervous energy and inability to supply and conduct nervous impulses properly, consequent upon a mental persuasion which interferes with these activities, have come to occupy an ever larger and larger place in the field of medicine. The war has been illuminating in this matter. A psycho-neurosis is, after all, a hysterical manifestation and it might very well be expected that very few of these would be encountered in armies which took only the _men_ of early adult life and from among those, only persons who had been demonstrated to be physically and, as far as could be determined, mentally normal. Neurologists would seem scarcely to have a place in the war except for wounds of nerves {259} and the cerebral location of missiles and lesions. Certainly none of the army medical departments had the slightest premonition that neurology would bulk larger in their war work than any other department except surgery. That proved to be the case, however. The surprise was to have, from very early in the war, literally thousands of cases of psycho-neuroses, "shell shock" as unfortunately they came to be called, which included hysterical symptoms of all kinds, mutism, deafness, blindness, paralysis, and contractures. France and England after some time actually had to maintain some fifty thousand beds in their war hospitals mainly for functional nervous diseases, the war neuroses of many kinds. During the first half of the war, one seventh of all the discharges from the British army or actually one third of all the discharges, if those from wounds were not included, were for these war neuroses. They attacked particularly the better educated among the men and were four times as prevalent among officers as among the privates. In proportion to the whole number of those exposed to shells and "war's alarms and dangers" generally, these war neuroses were {260} more common among the men than among the women. Nurses occasionally suffered from them, but not so frequently as the men who shared their dangers in the hospitals and stations for wounded not far from the firing line.