CONTENTS

CHAPTER I
PAGES
THE EFFECT OF THE EMOTIONS ON DIGESTION
Emotions favorable to normal secretion of the digestive juices—Emotions unfavorable to normal secretion of the digestive juices—Emotions favorable and unfavorable to contractions of the stomach and intestines—The disturbing effect of pain on digestion [1]–21
CHAPTER II
THE GENERAL ORGANIZATION OF THE VISCERAL NERVES CONCERNED IN EMOTIONS
The outlying neurones—The three divisions of the outlying neurones—The extensive distribution of neurones of the “sympathetic” or thoracico-lumbar division and their arrangement for diffuse action—The arrangement of neurones of the cranial and sacral divisions for specific action—The cranial division a conserver of bodily resources—The sacral division a group of mechanisms for emptying—The sympathetic division antagonistic to both the cranial and the sacral—Neurones of the sympathetic division and adrenal secretion have the same action [22]–39
CHAPTER III
METHODS OF DEMONSTRATING ADRENAL SECRETION AND ITS NERVOUS CONTROL
The evidence that splanchnic stimulation induces adrenal secretion—The question of adrenal secretion in emotional excitement—The method of securing blood from near the adrenal veins—The method of testing the blood for adrenin [40]–51
CHAPTER IV
ADRENAL SECRETION IN STRONG EMOTIONS AND PAIN
The evidence that adrenal secretion is increased in emotional excitement—The evidence that adrenal secretion is increased by “painful” stimulation—Confirmation of our results by other observers [52]–65
CHAPTER V
THE INCREASE OF BLOOD SUGAR IN PAIN AND GREAT EMOTION
Glycosuria from pain—Emotional glycosuria—The rôle of the adrenal glands in emotional glycosuria [66]–80
CHAPTER VI
IMPROVED CONTRACTION OF FATIGUED MUSCLE AFTER SPLANCHNIC STIMULATION OF THE ADRENAL GLAND
The nerve-muscle preparation—The splanchnic preparation—The effects of splanchnic stimulation on the contraction of fatigued muscle—The first rise in the muscle record—The prolonged rise in the muscle record—The two factors: arterial pressure and adrenal secretion [81]–94
CHAPTER VII
THE EFFECTS ON CONTRACTION OF FATIGUED MUSCLE OF VARYING THE ARTERIAL BLOOD PRESSURE
The effect of increasing arterial pressure—The effect of decreasing arterial pressure—An explanation of the effects of varying the arterial pressure—The value of increased arterial pressure in pain and strong emotion [95]–109
CHAPTER VIII
THE SPECIFIC RÔLE OF ADRENIN IN COUNTERACTING THE EFFECTS OF FATIGUE
Variations of the threshold stimulus as a measure of irritability—The method of determining the threshold stimulus—The lessening of neuro-muscular irritability by fatigue—The slow restoration of fatigued muscle to normal irritability by rest—The quick restoration of fatigued muscle to normal irritability by adrenin—The evidence that the restorative action of adrenin is specific—The point of action of adrenin in muscle [110]–134
CHAPTER IX
THE HASTENING OF THE COAGULATION OF BLOOD BY ADRENIN
The graphic method of measuring the coagulation time—The effects of subcutaneous injections of adrenin—The effects of intravenous injections—The hastening of coagulation by adrenin not a direct effect on the blood [135]–160
CHAPTER X
THE HASTENING OF COAGULATION OF BLOOD IN PAIN AND GREAT EMOTION
Coagulation hastened by splanchnic stimulation—Coagulation not hastened by splanchnic stimulation if the adrenal glands are absent—Coagulation hastened by “painful” stimulation—Coagulation hastened in emotional excitement [161]–183
CHAPTER XI
THE UTILITY OF THE BODILY CHANGES IN PAIN AND GREAT EMOTION
The reflex nature of bodily responses in pain and the major emotions, and the useful character of reflexes—The utility of the increased blood sugar as a source of muscular energy—The utility of increased adrenin in the blood as an antidote to the effects of fatigue—The question whether adrenin normally secreted inhibits the use of sugar in the body—The vascular changes produced by adrenin favorable to supreme muscular exertion—The changes in respiratory function also favorable to great effort—The effects produced in asphyxia similar to those produced in pain and excitement—The utility of rapid coagulation in preventing loss of blood [184]–214
CHAPTER XII
THE ENERGIZING INFLUENCE OF EMOTIONAL EXCITEMENT
“Reservoirs of power”—The excitements and energies of competitive sports—Frenzy and endurance in ceremonial and other dances—The fierce emotions and struggles of battle—The stimulating influence of witnesses and of music—The feeling of power [215]–231
CHAPTER XIII
THE NATURE OF HUNGER
Appetite and hunger—The sensation of hunger—The theory that hunger is a general sensation—Weakness of the assumptions underlying the theory that hunger is a general sensation—Body need may exist without hunger—The theory that hunger is of general origin does not explain the quick onset and the periodicity of the sensation—The theory that hunger is of general origin does not explain the local reference—Hunger not due to emptiness of the stomach—Hunger not due to hydrochloric acid in the empty stomach—Hunger not due to turgescence of the gastric mucous membrane—Hunger the result of contractions—The “empty” stomach and intestines contract—Observations suggesting that contractions cause hunger—The concomitance of contractions and hunger in man [232]–266
CHAPTER XIV
THE INTERRELATIONS OF EMOTIONS
Antagonism between emotions expressed in the sympathetic and in the cranial divisions of the autonomic system—Antagonism between emotions expressed in the sympathetic and in the sacral divisions of the autonomic system—The function of hunger—The similarity of visceral effects in different strong emotions and suggestions as to its psychological significance [267]–284
CHAPTER XV
ALTERNATIVE SATISFACTIONS FOR THE FIGHTING EMOTIONS
Support for the militarist estimate of the strength of the fighting emotions and instincts—Growing opposition to the fighting emotions and instincts as displayed in war—The desirability of preserving the martial virtues—Moral substitutes for warfare—Physical substitutes for warfare—The significance of international athletic competitions [285]–301
A LIST OF PUBLISHED RESEARCHES FROM THE PHYSIOLOGICAL LABORATORY IN HARVARD UNIVERSITY [302]–303
INDEX [305]