If we study attentively the history of any such person coming under our observation, we shall often find that he has been living for a considerable time in a sort of peculiar individual isolation, more or less shut off from the world of reality. This constrained condition of aloofness may be traced back to certain innate or early acquired peculiarities, which show themselves in the events of his life. For instance, in the histories of those suffering from dementia præcox we often hear such a remark as this: "He was always of a pensive disposition, and much shut up in himself. After his mother died he cut himself off still more from the world, shunning his friends and acquaintances." Or again, we may hear, "Even as a child he devised many peculiar inventions; and later, when he became an engineer, he occupied himself with most ambitious schemes." Without discussing the matter further it must be plain that a counterpoise is produced in the unconscious as a compensation to the one-sidedness of the conscious attitude. In the first case we may expect to find an increasing pressing forward in the unconscious, of a wish for human intercourse, a longing for mother, friends, relatives; while in the second case self-criticism will try to establish a correcting balance. Among normal people a condition never arises so one-sided that the natural corrective tendencies of the unconscious entirely lose their value in the affairs of everyday life; but in the case of abnormal people, it is eminently characteristic that the individual entirely fails to recognise the compensating influences which arise in the unconscious. He even continues to accentuate his one-sidedness; this is in accord with the well-known psychological fact that the worst enemy of the wolf is the wolf-hound, the greatest despiser of the negro is the mulatto, and that the biggest fanatic is the convert; for I should be a fanatic were I to attack a thing outwardly which inwardly I am obliged to concede as right. The mentally unbalanced man tries to defend himself against his own unconscious, that is to say, he battles against his own compensating influences. The man already dwelling in a sort of atmosphere of isolation, continues to remove himself further and further from the world of reality, and the ambitious engineer strives by increasingly morbid exaggerations of invention to disprove the correctness of his own compensating powers of self-criticism. As a result of this a condition of excitation is produced, from which results a great lack of harmony between the conscious and unconscious attitudes. The pairs of opposites are torn asunder, the resulting division or strife leads to disaster, for the unconscious soon begins to intrude itself violently upon the conscious processes. Then odd and peculiar thoughts and moods supervene, and not infrequently incipient forms of hallucination, which clearly bear the stamp of the internal conflict.