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This paper is an attempt to correlate certain psychical phenomena with groups of clinical symptoms and to assess the biological value of functional nervous diseases. An emotional tone indicates the reaction of an organism to its surroundings, emotionalism being characteristic of either harmony or discord. This dual aspect has an important bearing on the genesis of certain clinical states. It is pointed out that an acute difference exists between reproduction and flight when considered from various standpoints. The emotion of tenderness never has a sudden conscious onset and its maximum period is maintained for some time. Fear, on the contrary, has a sudden onset, and its maximum intensity is attained immediately and rapidly declines. The mental state of the animal, when afraid, is one of confusion, but in the case of the tender emotion, one of concentration on a specific object. The emotions are further compared in relation to the re-inducibility of the emotion and the state of the animal in the intervals. The value of emotional control is contrasted. In the case of reproduction this may be harmful, whereas in fear, the value is reinforced by control. In considering psychical dissociation the author thinks that a terrifying experience subjected to amnesia, is always re-experienced de novo, as far as the empirical ego is concerned. The associated emotionalism eventually disappears unless the initial experience recurs. The degree of amnesia developed varies according to the amount of conscious attention at the time, the confusion of the animal varying with this. If the experience recurs in similar form a similar somatic response will occur. This response will tend