In this way it was found that neurasthenia really corresponds to a monotonous morbid picture in which, as shown by the analysis, “psychic mechanisms” play no part. From neurasthenia we sharply distinguished the compulsion neurosis (Zwangsneurose), [obsessions, doubts, impulses], the neurosis of the genuine obsessions, in which we can recognize a complicated psychic mechanism, an etiology resembling the one of hysteria, and a far reaching possibility of an involution by psychotherapy. On the other hand it seemed to me undoubtedly imperative to separate from neurasthenia a neurotic symptom-complex which depends on a totally divergent, strictly speaking, on a contrary etiology. The partial symptoms of this complex have been recognized by E. Hecker[27] as having a common character. They are either symptoms, or equivalents, or rudiments of anxiety manifestations, and it is for that reason that this complex, so different from neurasthenia, was called by me anxiety neurosis. I maintain that it originates from an accumulation of physical tension which is in turn of a sexual origin. This neurosis, too, has no psychic mechanism, but regularly influences the psychic life, so that among its regular manifestations we have anxious expectation, phobias, hyperesthesias to pain, and other symptoms. This anxiety neurosis, as I take it, certainly corresponds in part to the neurosis called hypochondria, which in some features resembles hysteria and neurasthenia. Yet in none of the earlier works can I consider the demarcation of this neurosis as correct, and moreover, I find that the usefulness of the name hypochondria is impaired by its close relation to the symptom of “nosophobia.” After I had thus constructed for myself the simple picture of neurasthenia, anxiety neuroses, and obsessions, I turned my attention to the commonly occurring cases of neuroses which enter into the diagnosis of hysteria. I now said to myself that it would not do to mark a neurosis as hysterical on the whole, merely because its symptom complex evinced some hysterical signs. I could readily explain this practice by the fact that hysteria is the oldest, the most familiar, and the most striking neurosis under consideration, but still it was an abuse which allowed the placing of many features of perversion and degeneration under the caption of hysteria. Whenever a hysterical symptom, such as anesthesia or a characteristic attack, could be discovered in a complicated case of psychic degeneration, the whole thing was called “hysteria,” and hence one could naturally find united under this same trade mark the worst and most contradictory features. As certain as this diagnosis was incorrect it is also certain that our classification must be made from the neurotic standpoint, and as we know neurasthenia, anxiety neurosis, and similar conditions in the pure state, there is no need of overlooking them in combination.