Summing up, then, we may say _one of the chief functions of emotion_ is to provide the conative force which enables ideas to fulfill their aims, and one of the chief functions of sentiments to control and regulate the emotions. Besides the instinctive dispositions proper there are other innate dispositions which similarly provide conative force and determine activities. For the practical purposes of the problems with which we are concerned, the conative or impulsive forces of all such innate dispositions and the sentiments which they help to form are here, it should be understood, considered together and included under instincts. =The conative function of emotion.=—I shall take up in a later lecture[223] (in connection with the psychogenesis of multiple personality) the instincts and sentiments for discussion in more detail. The point to which I wish in this connection to call attention is that when a simple emotion-instinct, or an idea linked with an instinct (a sentiment) is awakened by any stimulus, _its impulsive force is discharged in three directions_: the _first_ is toward the excitation of those articulated movements and ideas which guide and carry the instinct to fruition—to fight in the case of anger, to flee in the case of fear, to cherish in the case of love, etc. _Second_ (accessory to the first) the excitation of many of the various visceral functions which we have reviewed reinforces the instinctive movements; e. g., for pugnacity or flight the increased respiration and activity of the heart increase the supply of oxygen and blood to the muscles; the secretion of sweat regulates the temperature during increased activity, the increased secretion of adrenalin and the increased secretion of sugar may, as Cannon suggests, respectively keep up the emotional state (after the cause of the fear or anger has subsided) and meet the demand of the muscles for an extra supply of food, etc. Later experiments of Cannon seem to show that the adrenal secretion removes the fatigue of muscles; and, further, that stimulation of the splanchic nerves will largely recover fatigued muscles, increasing the efficiency as much as 100 per cent.[224] As emotion discharges its impulses along splanchic pathways to the adrenal glands, the inference as to the function of emotion in overcoming fatigue is obvious.