This demand for the consideration of the whole personality, mind and body, ought not to be influenced by the popular separation between organic and functional diseases. If we call organic diseases of the mind those in which the mental disturbance is the accompaniment of a brain disturbance, and functional those in which no brain disturbance exists, we leave entirely the ground of modern psychology. As soon as we believe that the mind can be disturbed without a change in the functions of the brain, we give away all that which has brought scientific order into the study of psychological existence. Every mental disturbance corresponds to a disorder in the brain's functions. But there cannot be a change in the functions of the brain without a change in its structure. Thus we must claim that all those so-called functional disturbances like neurasthenia and hysteria, fixed ideas and obsessions, phobias and dissociations of the personality, as well as the typical insane states of the maniac or paranoiac have their basis in a pathological change of the anatomical structure of the brain. This postulate cannot be influenced by the fact that the microscope has been unable to detect the character of most of these changes. Of course all this does not exclude its being perfectly justifiable to separate those diseases for which a definite destruction of the brain parts can be detected, as in paralysis of the brain, from those where that is impossible. We may also expect that those disturbances in the brain which we cannot as yet make visible, may allow more easily an organic repair and thus a restoration to the normal functions. Just as a disjointed arm may be brought to function quickly again, a broken arm slowly, an amputated arm never, each brain cell too may suffer lesions which are reparable in different degrees. But it is evident that it remains then an entirely empirical question whether the invisible damage allows repair or not. We have no right to say that where the destruction cannot be seen under the microscope there is no organic change and the disturbance is therefore only a psychical one and can be removed by mental means. All changes are physical and experience has to decide whether they are accessible to psychological influences or not. States like epilepsy may not allow any recognition of definite brain destruction and are yet on the whole inaccessible to mental influence, while many a brain disturbance with visible alterations, resulting perhaps from anaemia or hyperaemia, may be caused to disappear. If on the other hand we say that we can cure with psychotherapeutic means only the functional brain diseases and define as functional simply those diseases which can be cured by such means, we move, of course, in the most obvious circle and yet just that is the too frequent fate of the discussions in certain quarters.