Ill weeds grow rank in such a soil. Not only are sexual appetites and affections almost the strongest; but, as is now well recognized, in the complex attitude of mankind to the invisible world they have no inconsiderable share. Marriage is a status hemmed about by many taboos and easily lending itself to mystical presentation. It is natural that the demise of one of the parties should cause a shock to the survivor corresponding to the change of condition involved, and should powerfully affect the sexual impulses. Even {233} apart from marriage they are an object on which the thought of mankind, whether savage or civilized, broods with a persistent endeavour to solve the mystery surrounding them. Hints are seen in them for the solution of many a problem other than that of the propagation of the species. The ideas suggested by their contemplation are utilized alike for practical and economical purposes (for example, in agricultural magic), and for speculation on the transcendent themes of life and death and the constitution of the universe. The tales and superstitions I have brought together exhibit these impulses emphasizing the terror of the dead. Many of the phenomena of dreams, and the phenomena of hysteria and various forms of delusion are due to the sexual impulses. The sexual impulses in turn are in many, if not all, of the cases referred to above greatly aided by the conditions imposed on the patient. No less than luxury and over-feeding, fasting and abstinence from the ordinary and reasonable gratification of animal appetites, and from social intercourse, are the parents of nightmare and delusion. Both extremes lead through physical disturbances to disorders of the imagination and the reason. Hermits and celibates have probably suffered even more than rakes and gluttons and drunkards. The annals of monasticism with tiresome and pitiful iteration record the disastrous effects of asceticism upon body and mind. Among savage and barbarous peoples these effects are as a rule less noxious, because the conditions inducing and accelerating them are less continuous. But it is precisely at the time when sexual relations are put out of normal gear, and the sexual impulses are left without their normal gratification, that exclusion from society and abstinence, sometimes from sleep, always {234} from food usual in quality and amount, are imposed. The imagination, already stimulated by the shock of the death (rarely attributed to natural causes), the possibility of an accusation of witchcraft hanging over the widow’s head, the certainty in many cases (as among the tribes of British Columbia) of a long period of hardship and even torture, all combine with the exclusion and enforced abstinence to produce a state of unnatural excitement, amounting at times to terror and delusion--in any case liable powerfully to affect the dreams, and to produce hysteria.