If food is taken mechanically and without appetite, if the preliminary changes in the stomach wall which are necessary for adequate digestion do not take place, but are inhibited by the mental unrest, the meal is apt to be followed by gastric pain and discomfort, or, more commonly with children, the stomach may promptly reject its contents. At the worst, nervous vomiting of this sort may follow almost every meal, although, again, it is curious to note how little, comparatively speaking, the nutrition of the child suffers. The vomiting too, as in adults, comes very near being a voluntary act, and mothers and nurses will often remark that they get the impression that it can be controlled at will. If once the diagnosis is made that the want of appetite or the vomiting is of nervous origin, the treatment of the condition is clear. Sedative drugs directed towards quieting the nervous excitability may be of service, but tonics, appetisers, laxatives, and drugs with a direct action on the stomach will have but little effect. Nor is there as a rule anything to be gained by modifying the diet or by excluding this or that article of food. The frequency of the vomiting is such that it is apt to have brought discredit one after the other upon almost every article of food which the child can take, with the result that many useful and necessary foods have been abandoned for long on the ground that they are the cause of the dyspepsia. A permanent cure will only be effected when the faults of environment have been overcome, when the cause of the nervous unrest has been removed, and when the child's mind is at peace. Nervous vomiting of this kind is not difficult to control, if those in charge of the children can be made to understand that the cause lies in the anxiety which they themselves show before the child, increasing his own apprehension or adding to his sense of power or importance. Once the child is convinced that his conduct excites no particular interest, the vomiting soon ceases. In more than one instance, vomiting which has persisted for many months has stopped at once after the matter has been fully explained to the parents. In the most inveterate case of this sort which has come under my notice, the child was regularly sick as soon as he caught sight of a white cloth being laid on the table for meals. Yet even this child never vomited when he was under the charge of a particular nurse who had to return more than once to the family, and on each occasion was successful in breaking the habit. CHAPTER IV WANT OF SLEEP