More manifest still are the physiological benefits of emotional pleasures. Every power, bodily and mental, is increased by "good spirits," which is our name for a general emotional satisfaction. The truth that the fundamental vital actions--those of nutrition--are furthered by laughter-moving conversation, or rather by the pleasurable feeling causing laughter, is one of old standing; and every dyspeptic knows that in exhilarating company, a large and varied dinner, including not very digestible things, may be eaten with impunity, and, indeed, with benefit, while a small, carefully chosen dinner of simple things, eaten in solitude, will be followed by indigestion. This striking effect on the alimentary system is accompanied by effects, equally certain though less manifest, on the circulation and the respiration. Again, one who, released from daily labors and anxieties, receives delights from fine scenery or is enlivened by the novelties he sees abroad, comes back showing by toned-up face and vivacious manner, the greater energy with which he is prepared to pursue his avocation. Invalids especially, on whose narrowed margin of vitality the influence of conditions is most visible, habitually show the benefits derived from agreeable states of feeling. A lively social circle, the call of an old friend, or even removal to a brighter room, will, by the induced cheerfulness, much improve the physical state. In brief, as every medical man knows, there is no such tonic as happiness. These diffused physiological effects of pleasures and pains, which are joined with the local or special physiological effects, are, indeed, obviously inevitable. We have seen (_Principles of Psychology_, §§ 123-125) that while craving, or negative pain, accompanies the under-activity of an organ, and while positive pain accompanies its over-activity, pleasure accompanies its normal activity. We have seen that by evolution no other relations could be established; since, through all inferior types of creatures, if defect or excess of function produced no disagreeable sentiency, and medium function no agreeable sentiency, there would be nothing to insure a proportioned performance of function. And as it is one of the laws of nervous action that each stimulus, beyond a direct discharge to the particular organ acted on, indirectly causes a general discharge throughout the nervous system (_Prin. of Psy._, §§ 21, 39), it results that the rest of the organs, all influenced as they are by the nervous system, participate in the stimulation. So that beyond the aid, more slowly shown, which the organs yield to one another through the physiological division of labor, there is the aid, more quickly shown, which mutual excitation gives. While there is a benefit to be presently felt by the whole organism from the due performance of each function, there is an immediate benefit from the exaltation of its functions at large caused