After a diarrhoea begins we should at once reduce the quantity of fat in the milk that is being given to the infant, and if the trouble be at all severe it is best to take it off of all food for twenty-four hours, and substitute boiled water or barley-water. As soon as the trouble is checked we may then begin to feed cautiously with largely diluted milk, and, gradually increasing its strength, in the course of a few days return to the food that was being given before the disturbance occurred. A dose of calomel or castor oil in the beginning of diarrhoeal troubles often has a very salutary effect; the parent should not hesitate to administer this if a doctor is not at hand. In warm climates during the time of teething children very commonly develop chronic diarrhoeal conditions which often end fatally; wherever possible the parent should under such circumstances at once remove the little sufferer to a colder climate where recovery is generally rapid and complete. Even the most careful nursing under the most competent physician is often fruitless in combating disorders of this character as long as the infant remains in a warm climate. _Colic._--Colic is always due to indigestion, and is the result of the food undergoing fermentative changes, with the production of gases. This goes on even under normal conditions to a certain extent, but when it is excessive the intestines become greatly distended, and pain of a severe or even agonizing character is produced. In the treatment of this condition warm applications should be made to the abdomen, and as quickly as possible an enema (injection), consisting of a few ounces of warm solution of salt water should be given; the salt should be in the proportion of a level teaspoonful to the quart of water. Parents will find the little ear syringe, which may be purchased at any drug store, a most satisfactory instrument for giving enemas to infants, as they do not hold too much, and being soft, are incapable of tearing the delicate tissues of the child. It is of the utmost importance to remember that the salt solution should be tepid, yet not sufficiently hot to scald the infant. As the water when given in this way is expelled very quickly the enemas may be repeated any number of times desired. Where these measures fail, a physician should be sent for at once, but in the meantime if it be evident that the infant is suffering very much, a small dose of paregoric may be given; it should not however be forgotten that opiates are exceedingly hurtful to nervous children, and that soothing syrups and other mixtures containing drugs of this class should be avoided.