The same vasomotor instability which shows itself in the tendency to syncopal attacks is apparent in many other ways.  Sudden sensations of heat and of flushing, equally sudden attacks of pallor, coldness of the extremities, abundant perspiration,—­raising in the mind of the anxious mother the fear of consumption,—­and excessive diuresis are common accompaniments.  A further group of symptoms is provided by the extreme sensibility of the digestive apparatus.  Dyspepsia, hyperaesthesia of the intestinal tract, viscero-motor atonies and spasms, and anomalies of the secretions, whether specific like that of the gastric juice or indifferent like that of the nasal, pharyngeal, gastric, and intestinal mucus, are all of common occurrence.  Whenever the nervous child is subjected to any exhausting experience, any excitement, pleasurable or the reverse, or any undue exertion, whether mental or physical, one may note the subsequent gastro-intestinal derangement, including even a coating of the tongue.  The slightest deviation from the usual diet, the most trivial fatigue, a chill of the body, even a change in the temperature of the food may set loose the most extreme reactions in the gastro-intestinal tract—­motor, sensory, or secretory.  It is not an accident that so often the mucous diarrhoea, which may have afflicted an excitable child in London for many months, and which a visit to the seaside, with all its healthy activities, may seem to have completely cured, relapses within a day or two of the return to the restricted environment and uninteresting routine of life in London.  The child who was happy and busy and at peace with himself, at play in the open air, resents the sudden cessation of all this, and the nervous unrest returns.  To attempt treatment by dietetic restrictions alone is to deal only with a symptom.  The gastro-intestinal reactions are so violent that the parents are generally voluble on the subject of the many foods which cannot be taken and the few which are not suspect.  To prescribe rigid tables of diet is to add to the alarm of the mother, and to sustain her in the belief that the child is in daily danger of being poisoned by a variety of common articles of diet.  Only by lowering the excitability of the nervous system, by occupying the mind and giving strength to the child’s powers of control can we effectively combat the hyperaesthesia.  If necessary the personnel of the management of the child will have to be altered.  There may be no other way to achieve certain and rapid improvement in a condition which is causing grave danger to the child and very genuine distress and suffering to the parents.  A violent reaction to intoxications of all sorts is a further stigma of nervous instability.  Sudden and even inexplicable rises of temperature are frequent complaints, and the constitutional effects of even trivial local infections are apt to be disproportionately great.