Disordered Action of the Sensibilities.—Another form of insanity is that which consists in, or arises from, not any primary disorder of the intellectual faculties, but a tendency to disordered emotional excitement. Sometimes this is general, extending to all the emotions. These cases require careful treatment. The patient is like a child, and must be governed mildly and wisely, is open to argument and motives of self-control. In other cases, some one emotion is particularly the seat and centre of the disturbance, while the others are comparatively tranquil. In such cases the exaggerated emotion may prompt to some specific action, as suicide, or murder, etc. This is termed impulsive insanity. The predominant idea or impulse tyrannizes over the mind, and, by a sort of irresistible fatality, drives it on to the commission of crime. The patient may be conscious of this impulse, and revolt from it with horror; there may be no pleasure or desire associated with the deed, but he is unable to resist. He is like a boat in the rapids of Niagara. So fearful the condition of man when reason is dethroned, and the will no longer master.