What impressed me most of all while I was with Charcot were his latest investigations upon hysteria, some of which were carried out under my own eyes. He had proved, for instance, the genuineness of hysterical phenomena and their conformity to laws (“_introite et hic dii sunt_”), the frequent occurrence of hysteria in men, the production of hysterical paralyses and contractures by hypnotic suggestion and the fact that such artificial products showed, down to their smallest details, the same features as spontaneous attacks, which were often brought on traumatically. Many of Charcot’s demonstrations began by provoking in me and in other visitors a sense of astonishment and an inclination to scepticism, which we tried to justify by an appeal to one of the theories of the day. He was always friendly and patient in dealing with such doubts, but he was also most decided; it was in one of these discussions that (speaking of theory) he remarked, “_Ça n’empêche pas d’exister_,” a _mot_ which left an indelible mark upon my mind. No doubt the whole of what Charcot taught us at that time does not hold good today: some of it has become doubtful, some has definitely failed to withstand the test of time. But enough is left over, and has found a permanent place in the storehouse of science. Before leaving Paris I discussed with the great man a plan for a comparative study of hysterical and organic paralyses. I wished to establish the thesis that in hysteria paralyses and anæsthesias of the various parts of the body are demarcated according to the popular idea of their limits and not according to anatomical facts. He agreed with this view, but it was easy to see that in reality he took no special interest in penetrating more deeply into the psychology of the neuroses. When all is said and done, it was from pathological anatomy that his work had started. Before I returned to Vienna I stopped for a few weeks in Berlin, in order to gain a little knowledge of the general disorders of childhood. Kassowitz, who was at the head of a public institute in Vienna for the treatment of children’s diseases, had promised to put me in charge of a department for the nervous diseases of children. In Berlin I was given assistance and a friendly reception by Baginsky. In the course of the next few years I published, from the Kassowitz Institute, several monographs of considerable size on unilateral and bilateral cerebral palsies in children. And for that reason, at a later date (in 1897), Nothnagel made me responsible for dealing with the same subject in his great _Handbuch der allgemeinen und speziellen Therapie_.