I place reliance on the opinion that the patient’s affection for her brother-in-law, intensive as it was, was not clearly known to her except on certain rare occasions and then only momentarily. If that were not so she would have become conscious of the inconsistency between this fondness and her moral ideas and would have had to endure the same mental agony which I saw her suffer after the analysis. Her reminiscences gave us no information concerning such suffering. These she spared herself and as a result the love itself did not become clear to her. At that time, as well as during the analysis, her love for her brother-in-law existed in the form of a foreign body in her consciousness without entering into any relationship with her other ideation. In reference to this love there existed the peculiar condition of knowing and simultaneously not knowing, it was the condition of the split off psychic group. When we assert that this love was not “clearly known” to her we mean exactly what we say. We do not mean a lower quality or a lesser degree of consciousness, but a separation of the free associative thinking process from the rest of ideation. How does it come about that such an intensively accentuated presentation group should be kept so isolated? As a rule the rôle played by an idea in the association really increases with the sum of its affect. This question can be answered if we bear in mind two facts which we can make use of as a safeguard: (1) That the hysterical pains originated simultaneously with the formation of these separate psychic groups, (2) that the patient exerted great resistance against the attempt to bring about the association between the separate psychic groups and the rest of the content of consciousness, and when the union was finally effected she perceived excessive psychic pain. Our conception of hysteria brings together these two moments with the fact of the splitting of consciousness, for (2) contains the indication for the motive for the splitting of consciousness while (1) shows the mechanism of the same. The motive was that of defense, it was the striving of the whole ego to agree with this presentation group and the mechanism was that of conversion, that is, instead of psychic pains which she spared herself there appeared physical pains. Thus a transformation occurred through which gain the patient had escaped an unbearable psychic state, though it was at the cost of a psychic anomaly in the form of a splitting of consciousness and a physical suffering, pains, upon which an astasia-abasia was constructed. To be sure I can give no instruction as to how one can bring about such a conversion. It is not apparently done as one intentionally does an arbitrary action, it is a process which is executed in the individual under the impulse of the motive of defense if an adaptation for it exists in his organization or is brought about by temporary modification.