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