In the milder types we find the following symptoms present. There is a marked feeling of well being. The patient, having lost sight of his personal limitations, feels a consequent exalted opinion of himself. His conduct is often rather boisterous, he talks a great deal, often swearing and using obscene language. He is inconsiderate of others and tries to impose his will upon those about him. There goes with this a certain unstability of the emotional tone as manifested by the quickly changing feeling of good humor, irritability and anger. There is a rapid flow of ideas with a marked loss in the ability to concentrate and direct thought. The ideas which pass through the mind do not coordinate themselves toward a definite goal, but deviate from the course of consecutive thinking by any passing association. Again there is a restlessness and activity beyond all normal bounds. The individual feels strong physically and mentally. The appetite is unusually good and if activity is not too extreme there may be a gain in weight. The period of sleep is diminished and the feeling of fatigue is reduced. In the more exaggerated cases the flight of ideas becomes more marked, the associations are more rapid and superficial and the attention is focused but momentarily. Illusions and delusions may be present due to the imperfect preceptions from inability to concentrate attention and from abnormal associations. Rhyming speech, disconnection of phrases and even apparent incoherence are often present. The state of mind may be such that the patient tears his clothing, breaks up furniture, jumps, dances and shouts and often will not take time to eat. The most extreme cases which refuse food over some period of time progress rapidly to exhaustion and measures to conserve strength become imperative. =Depressive Phase.=—In this phase of the disorder are encountered manifestations which are in direct contrast to those presented in the manic phase. In place of the exalted emotional state there is a depression. There is a tendency to worry over trivial matters of the daily routine and of instances in past life. Introspection is the predominant mental attitude and the whole outer world is colored by the inner feeling of worry and uncertainty. Replacing the rapidity of thought in the manic phase there is a distinct slowing of mental processes in the depressive phase. Thinking is more difficult and labored, questions are answered slowly and with an apparent effort and there is usually a tendency to avoid social life. Again replacing the excessive activity in mania the depressions show a retarded action. There is disinclination or disability toward any effort either motor or mental. The patient feels weak and incapable of effort, the body assumes a bent attitude and the facial expression is one of despondency. The appetite is usually impaired with resultant loss of weight, the bowels are sluggish, the period of sleep reduced.