"For several weeks my boy, three and a half years old, had been visiting the zoölogical garden every afternoon, in the company of a French maid of exceptionally forceful character, and apparently free from the superstitiousness of the average nurse. For a long time all went well, until one evening the boy began to cry soon after he was left for the night. At this unusual occurrence, I mounted the stairs and inquired the cause of the boy's trouble. "He said there were lions in the house and that he did not want to stay alone, as he was afraid they would eat him. The source of the idea had been that the lions had roared more loudly than usual on that particular afternoon, and he had been much impressed, standing for some time quite motionless before the cage, though terrified. I soon convinced the boy that the lions had to remain in their cages, and could not get out; hence, there were none in the house, so that there was no occasion to fear. Of course, it was first necessary to give him the feeling of security gained by embracing me; and, secondly, to begin the conversation by talking of something else--I have forgotten what. "In this way the state of terror was dismissed, and the feeling of protection was induced before we returned to the subject of the lions. Then we made rather a joke of the funny roaring of the lions before we had finished, and he finally lay down, with the solemn purpose to go to sleep and think, as I suggested, of the tramcars and motors passing outside his open window. It was all very simple substitution, but it was the prevention of what might have become a serious fear-psychosis if injudiciously handled."[18] It should be added that special need for training in emotional control is indicated if a child begins to be troubled, not by night terrors, but by another and more common childhood malady--somnambulism. The child who talks or walks in his sleep, like the child attacked by night terrors, is, for some reason, nervously unstrung; and, it may confidently be said, is usually unstrung because of the presence in his mind of disquieting ideas, conscious or subconscious. On this account, the parent should not be satisfied with the measures ordinarily employed in dealing with both night terrors and somnambulism--the prescribing of tonics and sedatives, outdoor exercise, abstinence from tea and coffee, reduction in meat in the diet, and so forth. Undeniably, these measures often result in a complete cessation of the nocturnal symptoms. But, even if, as a result of medication, exercise, and dieting, the disquieting ideas causing the symptoms no longer manifest their presence by the attacks that have alarmed the parents, these ideas still are left in the mind, perchance to cause still more alarming symptoms later. Accordingly, the really prudent parent, besides dieting his child, will endeavour to get at the mental source of trouble.