The mental states of psychopathic or nervous ills are of an infantile, child type. In this respect the mental states simulate cancerous and other malignant growths of an embryonic character. The psychopathic mental states are not only of a childish character, but they are often associated with child experiences of early life. The psychopathic condition points to some early fear-producing experience, or fear awakening shock. II. _The Principle of Recurrence_ Fear experiences tend to repeat themselves in consciousness, and especially in the subconscious states of the child. This repetition or recurrence keeps alive the psychopathic fear nucleus, and _fixes_ it in the mind. Fixed fear systems become further developed by the subsequent experiences of life. The aroused fear instinct may either become weakened or strengthened. When the conditions of life are unfavorable and adverse, tending to further cultivation of the impulse of self-preservation and the fear instinct, the outcome is a psychopathic disposition, ending in a nervous state with typical symptoms of some definite nervous trouble, formed by the _latest_ or _ultimate_ fear experiences. III. _The Principle of Proliferation and Complication_ With the growth of the child the fear experiences increase and multiply. These experiences become associated with the original child nucleus of fear and thus a complexity of fear systems is built up. Worries, depressions, and anxieties help to increase and develop the psychopathic system of groups of fear experiences. The morbid state grows like an avalanche in its progress downwards. IV. _The Principle of Fusion or of Synthesis_ All the fear experiences become associated and grouped gradually around the original child fear experience which is often of a subconscious character. The long series of fear experiences becomes fused and synthesized by the central fear instinct and impulse of self-preservation, which are fundamental in every being, but which have been specially cultivated by the course of events and experiences in the neurotic patient. The experiences become fused, synthesized, and systematized, forming one complex network of closely interrelated fear obsessions with the fear instinct and impulse of self preservation in the background. V. _The Principle of Contrast_ Feelings and emotions follow by contrast. Excitement is followed by depression, enjoyment by disgust, exhilaration by disappointment. This is well brought out in the changes observed in the psychopathic self and fear states. Fear may be followed by _anger_, especially against those who are sure to show no opposition, or may even manifest fear. The excitement of fear in others is a way which diminishes fear in the patient and helps him to have confidence in himself, strengthening his impulse of self preservation.