It can still be asked why the nervous system merges into a peculiar affective state of anxiety under the circumstances of psychic inadequacy for the subjugation of the sexual excitement? A hint to the answer is as follows: The psyche merges into the affect of fear when it perceives itself unable to adjust an externally approaching task (danger) by corresponding reaction; it merges into the neurosis of anxiety when it finds itself unable to equalize the endogenously originated (sexual) excitement. The psyche, therefore, behaves as if projecting this excitement externally. The affect and the neurosis corresponding to it stand in close relationship to each other; the first is the reaction to an exogenous, the latter the reaction to an analogous endogenous excitement. The affect is a rapidly passing state, the neurosis is chronic because the exogenous excitement acts like a stroke happening but once, while the endogenous acts like a constant force. The nervous system reacts in the neurosis against an inner source of excitement just as it does in the corresponding affect against an analogous external one. IV. THE RELATIONS TO OTHER NEUROSES. A few observations still remain to be mentioned on the relations of the anxiety neurosis to the other neuroses in reference to occurrence and inner relationship. The purest cases of anxiety neurosis are also usually the most pronounced. They are found in potent young individuals with a uniform etiology, and where the disease is not of long standing. To be sure, the symptoms of anxiety are found more frequently as a simultaneous and common occurrence with those of neurasthenia, hysteria, compulsive ideas, and melancholia. If on account of such clinical mixtures one hesitates in recognizing anxiety neurosis as an independent unity, he will also have to abandon the laboriously acquired separation of hysteria and neurasthenia. For the analysis of the “mixed neuroses” I can advocate the following proposition: Where a mixed neurosis exists, an involvement of many specific etiologies can be demonstrated. Such a multiplicity of etiological moments determining a mixed neurosis can only come about accidentally, if the activities of a newly formed injury are added to those already existing. Thus, for example, a woman who was at all times a hysteric begins to practice coitus reservatus at a certain period of her married life, and adds an anxiety neurosis to her hysteria; a man who had masturbated and become neurasthenic, becomes engaged and excites himself with his fiancée so that a fresh anxiety neurosis allies itself to his neurasthenia.