Fright, anxiety or anger may change the character of the milk so that colic, vomiting, and diarrhœa and indigestion are produced in the child. A wet nurse becomes homesick and the milk dries up. It may become extremely indigestible, as shown in cases where a wet nurse quarrels with her husband and her foster child develops green stools. If the mother’s milk does not agree, the child may be put on feedings for twenty-four or forty-eight hours, while the milk, pumped from the breast, is sent to a laboratory for analysis. If a return to the breast is unsatisfactory, artificial feedings or a wet nurse must be supplied. =Removal of the child from the breast= may be required for a variety of reasons. Thus, the mother’s addiction to alcohol or opium is good ground for taking away the child. Arsenic, bromides and iodides of potassium, saline cathartics, salicylates, alcohol, opium and belladonna must be given to the mother with great caution during lactation, for they pass over into the milk. Acute diseases, such as erysipelas, pneumonia, diphtheria, typhoid, malaria, pronounced puerperal sepsis or persistently high fever from any cause, usually dries up the milk; while cardiac lesions, unless well compensated, chronic anæmia and tuberculosis, obviously demand the removal of the child for the sake of both. Sometimes a new conception, especially when the milk becomes poor in the last half of gestation, compels the mother to wean her babe. A syphilitic woman may nurse her own child, provided her condition is good and the child also is syphilitic. Theoretically, the return of menstruation in no way affects the nursing child, unless the blood is lost to the point of anæmia. Yet cases do occur in which the child has indigestion, colic and bad stools, as well as loses weight, when the mother is menstruating. The quality of the milk is sometimes altered, but only for a day or so, and the child should continue at the breast unless some definite indication for removal arises. =Weaning= ordinarily is completed by the ninth month, but the child should never be carried beyond the twelfth month on account of changes in the character of the milk. When a child is weaned, the substitution of an artificial food may be made gradually,—a bottle a day, two bottles a day, etc., until, in a couple of weeks, the breasts are at rest. The excessive prolongation of lactation is shown upon the mother by impairment of the health. The patient is pale, weak, anæmic, fretful, and thin. Headaches, dizziness, loss of appetite, and constant fatigue will be complained of. The _treatment_ is to remove the child at once and put the mother on stimulating drugs and foods. A change of air and scenery, if possible, will be highly beneficial.