Freud considers that there are probably always three factors in the causation of any neurosis: a specific hereditary predisposition, secondly an unresolved infantile conflict which means that the person has not satisfactorily developed past a given stage of individual evolution—in other words, that he has been subjected to what is called an “infantile fixation” at a given point in development, and thirdly the current difficulty. There is a reciprocal relationship between these three factors, so that if any one is especially pronounced the others may be correspondingly less important. For instance, if the hereditary factor is very pronounced then a person may become neurotic from the quite ordinary experiences of childhood and adult life, for he is incapable of dealing adequately with them. In the case of war neuroses it is evident that the current factor is of the greatest importance, being, indeed, the only one that so far has attracted attention. The only traces of infantile factors I have seen noted have been the instances where the localisation of hysterical symptoms seems to have been determined in part by the site of old injuries, and in a general way the many traits of childhood, such as sensitiveness to slights, self-centredment, and desire to be guarded, protected, and helped, which are sometimes very evident in the cases of war neurosis. We thus see that only one half of the psycho-analytical theory has so far been confirmed by the observations of war neuroses. According to this theory, there are typically two sets of wishes concerned in the production of any neurosis. One of these, the “primary gain of illness”, a current one, alien to the conscious ego ideal, and therefore half repressed and only half conscious—if that—has not only been demonstrated by a number of observers, but has been shewn to be of tremendous importance, and certainly the effects of treatment largely turn on the way in which it is dealt with. The other factor, the infantile and altogether repressed and unconscious one, which, according to psycho-analysis, is also essential to the production of a neurosis, has not been systematically sought for, though I have found it in the few cases of which I have been able to make a full study. Its presence or absence is a matter of greater theoretical importance than might perhaps appear, even though its practical importance may often not be great. For my own part I have the utmost difficulty in believing that a current wish, however strong that is half conscious and sometimes fully conscious can ever in itself produce a neurosis, for it contradicts all one’s knowledge concerning the nature of neuroses, as well as my experience, such as it is, of war neuroses themselves. I would therefore urge that no conclusion is possible on the matter one way or the other until adequate investigations have been carried out. That it has its practical side also will be pointed out when we come to