Surveying the enormous material of observations of psycho-neurosis during and following the war, it looks at the first glance as if the old distinction between organic and functional nervous disorders has been more firmly established than ever. To most writers this distinction seems to be a fundamental one, and the majority of those nerve specialists, whom the war has developed in such abundant numbers, seem content to regard the distinction (which before the war was being regarded with increasing suspicion) as a permanent one—the primary distinction in the classification of all nervous disorders. It has even been suggested that the two groups should be studied and treated by two different classes of specialists—to my mind an arrangement that would represent a most effectual barrier to any further development of psycho-neurology.