a cushion in a velvet slipper, with the leg itself most decorously concealed. Later on, after a timid attempt at normal sexual activity during puberty, a thin sinewy foot like that of the governess became his only sexual object; and if still other features in the person reminded him of the type of woman represented by the English governess the man was helplessly attracted. This fixation of the Libido, however, rendered him not neurotic but perverse; he became, as we say, a foot-fetichist. So you see that although an excessive and, in addition, premature fixation of Libido is an indispensable condition in the causation of neurosis, the extent of its influence far exceeds the boundaries of the neuroses. This condition by itself is also as little decisive as the privation mentioned previously. So the problem of the causation of the neuroses seems to become more complicated. In fact, psycho-analytic investigation acquaints us with yet a new factor, not considered in our ætiological series, and best observed in someone whose previous good health is suddenly disturbed by falling ill of a neurosis. In these people signs of contradictory and opposed wishes, or, as we say, of _mental conflict_, are regularly found. One side of the personality stands for certain wishes, while another part struggles against them and fends them off. There is no neurosis without such a CONFLICT. There might seem to be nothing very special in this; you know that mental life in all of us is perpetually engaged with conflicts that have to be decided. Therefore it would seem that special conditions must be fulfilled before such a conflict can become pathogenic; we may ask what these conditions are, what forces in the mind take part in these pathogenic conflicts, and what relation conflict bears to the other causative factors. I hope to be able to give you answers to these questions which will be satisfactory although perhaps schematically condensed. Conflict is produced by privation, in that the Libido which lacks satisfaction is urged to seek other paths and other objects. A condition of it then is that these other paths and objects arouse disfavour in one side of the personality, so that a veto ensues, which at first makes the new way of satisfaction impossible. This is the point of departure for the formation of symptoms, which we shall follow up later. The rejected libidinal longings manage to pursue their course by circuitous paths, though not indeed without paying toll to the prohibition in the form of certain disguises and modifications. The circuitous paths are the ways of symptom-formation; the symptoms are the new or substitutive satisfactions necessitated by the fact of the privation.