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digestive and procreative functions are inhibited。 What is the significance of this stimulation of some and inhibition of other organs？ As far as we know； the stimulated organs increase the efficiency of the animal for fight or for flight。 It is through skeletal muscles that the physical attack or escape is effected； these muscles alone energize the claws； the teeth； the hoofs； and the means for flight。 The increased action of the muscles of the heart and the blood…vessels increases the efficiency of the circulation； the secretion of the adrenal gland causes a rise in the blood…pressure； the increased action of the thyroid gland causes an increased metabolic activity； there is evidence that glycogen is actively called out； this being the most immediately available substance for the production of energy； the increased activity of the respiration is needed to supply the greater need of oxygen and the elimination of the increased amount of waste products； the dilatation of the nostrils affords a freer intake of air； the increased activity of the sweat…glands is needed to regulate the temperature of the body which the increased metabolism causes to rise。 The activity of all the organs of perceptionsight； hearing； smell is increased in order that the danger may be more accurately perceived。 It cannot be a mere coincidence that the organs and the tissues that are stimulated in the emotion of fear are precisely those that are actually utilized in a physical struggle for self…preservation。
Are any other organs stimulated by fear except those that can or that do assist in making a defensive struggle？ I know of none。 On the other hand； if an animal could dispense with his bulky digestive organs； whose functions are suspended by fear； if he could； so to speak； clear his decks for battle； it would be to his advantage。 Although the marvelous versatility of natural selection apparently could devise no means of affording this advantage； it nevertheless shut off the nervous current and saved the vital force which is ordinarily consumed by these non…combatants in the performance of their functions。 Whatever may be the origin of fear； its phenomena are due to a stimulation of all the organs and tissues that add to the efficiency of the physical struggle for self…preservation and an inhibition of the func…
｛illust。 caption = FIG。 19THE BROAD JUMP。 Note the similarity of the expression to the facial expression of fear and of anger （Figs。 12 and 21）。 （Wm。 J。 Brownlow； drawn from photo。） tions of the leading organs that do not participate in that struggle the non…combatants； so to speak。 Fear arose from injury； and is one of the oldest and surely the strongest emotion。 By the slow process of vast empiricism nature has evolved the wonderful defensive motor me…chanism of many animals and of man。 The stimulation of this mechanism leading to a physical struggle is action； and the stimulation of this mechanism without action is emotion。 We may say； therefore； that fear is a PHYLOGENETIC FIGHT OR FLIGHT （Fig。 18）。 On this hypothesis all the organs and parts ｛illust。 caption = FIG。 20。…FINISH OF RELAY RACE。
Compare the facial expression of the runners with those in Figs。 12； 19； 22。 These pictures illustrate the fact that the same mechanism is stimulated in emotion as in physical action。 （Photo by Underwood and Underwood； N。 Y。）｝
of the body are integrated； connected； or correlated for the self…preservation of the individual by the activity of his motor mechanism （Figs。 12； 19； and 20）。 We fear not in our hearts alone； not in our brains alone； not in our viscera alonefear influences every organ and tissue； each organ or tissue is stimulated or inhibited according to its use or hindrance in the physical struggle for existence。 By thus concentrating all or most of the nerve force on the nerve…muscular mechanism for defense； a greater physical power is developed。 Hence it is that under the stimulus of fear animals are able to perform preternatural feats of strength。 For the same reason； the exhaustion following fear will be increased as the powerful stimulus of fear drains the cup of nervous energy even though no visible action may result。 An animal under the stimulus of fear may be likened to an automobile with the clutch thrown out but whose engine is racing at full speed。 The gasoline is being consumed； the machinery is being worn； but the machine as a whole does not move； though the power of its engine may cause it to tremble。
When this conception is applied to the human beings of today； certain mysterious phenomena are at once elucidated。 It must be borne in mind that man has not been presented with any new organs to meet the requirements of his present state of civilization； indeed； not only does he possess organs of the same type as those of his savage fellows； but of the same type also as those possessed by the lower animals even。 In fact； man has reached his present status of civilization with the primary equipment of brutish organs。 Perhaps the most striking difference between man and animals lies in the greater control which man has gained over his primitive instinctive reactions。 As compared with the entire duration of organic evolution； man came down from his arboreal abode and assumed his new role of increased domination over the physical world but a moment ago。 And now； though sitting at his desk in command of the complicated machinery of civilization； when he fears a business catastrophe his fear is manifested in the terms of his ancestral physical battle in the struggle for existence。 He cannot fear intellectually； he cannot fear dispassionately； he fears with all his organs； and the same organs are stimulated and inhibited as if； instead of it being a battle of credit； of position； or of honor； it were a physical battle with teeth and claws。 Whether the cause of acute fear be moral； financial； social； or stage fright； the heart beats wildly； the respirations are accelerated； perspiration is increased； there are pallor； trembling； indigestion； dry mouth； etc。 The phenomena are those which accompany physical exertion in self…defense or escape。 There is not one group of phenomena for the acute fear of the president of a bank in a financial crash and another for the hitherto trusted official who suddenly and unexpectedly faces the imminent probability of the penitentiary； or one for a patient who unexpectedly finds he has a cancer and another for the hunter when he shoots his first big game。 Nature has but one means of response to fear； and whatever its cause the phenomena are always the samealways physical。
If the stimulus of fear be repeated from day to day； whether in the case of a mother anxious on account of the illness of a child； a business man struggling against failure； a politician under contest for appointment； a broker in the daily hazard of his fortune； litigants in legal battle； or a jealous lover who fears a rival； the countless real as well as the baseless fears in daily life； in fact； all forms of fear； as it seems to me； express themselves in like terms of ancestral physical contests。 On this law； fear dominates the various organs and parts of the body。
Anger and fear express opposite emoti