7. On the basis of the chronic anxiousness (anxious expectation) on the one hand, and the tendency to vertiginous attacks of anxiety on the other, there develop two groups of typical phobias; the first refers to the general physiological menaces, while the second refers to locomotion. To the first group belong the fear for snakes, thunderstorms, darkness, vermin, etc., as well as the typical moral overscrupulousness, and the forms of doubting mania. Here the available fear is merely used to strengthen those aversions which are instinctively implanted in every man. But usually a compulsively acting phobia is formed only after a reminiscence is added to an experience in which this fear could manifest itself; as, for example, after the patient has experienced a storm in the open air. To attempt to explain such cases as mere continuations of strong impressions is incorrect. What makes these experiences significant and their reminiscences durable is after all only the fear which could at that time appear and can also appear today. In other words such impressions remain forceful only in persons with “anxious expectations.” The other group contains agoraphobia with all its accessory forms, all of which are characterized by their relation to locomotion. As a determination of the phobia we frequently find a precedent attack of vertigo; I do not think that it can always be postulated. Occasionally, after a first attack of vertigo without fear, we see that though locomotion is always accompanied by the sensation of vertigo, it remains possible without any restrictions, but as soon as fear attaches itself to the attack of vertigo, locomotion fails, under the conditions of being alone, narrow streets, etc. The relation of these phobias to the phobias of obsessions, which mechanism I discussed above,[42] is as follows: The agreement lies in the fact that here as there, an idea becomes obsessive through its connection with an available affect. The mechanism of transposition of the affect therefore holds true for both kinds of phobias. But in phobias of the anxiety neurosis this affect is (1) a monotonous one, it is always one of anxiety; (2) it does not originate from a repressed idea, and on psychological analysis it proves itself not further reducible, nor can it be attacked through psychotherapy. The mechanism of substitution does not therefore hold true for the phobias of anxiety neurosis.