The forces again Nemes., ch. 23., inherent in a living creature are, it should be noted, partly psychical, partly vegetative, partly vital. The psychical forces are concerned with free volition, that is to say, impulsive movement and sensation. Impulsive movement includes change of place and movement of the body as a whole, and phonation and respiration. For it is in our power to perform or refrain from performing these acts. The vegetative and vital forces, however, are quite outside the province of will. The vegetative, moreover, include the faculties of nourishment and growth, and generation, and the vital power is the faculty of pulsation. For these go on energising whether we will it or not.