The thrush is a frequent disease of an infant, and is often brought on either by stuffing him or by giving him improper food. A child brought up _entirely_, for the first three or four months, on the breast, seldom suffers from this complaint. The thrush consists of several irregular, roundish, white specks on the lips, the tongue, the inside and the angles of the mouth, giving the parts affected the appearance of curds and whey having been smeared upon them. The mouth is hot and painful, and he is afraid to suck: the moment the nipple is put into his mouth he begins to cry. The thrush sometimes, although but rarely, runs through the whole of the alimentary canal. It should be borne in mind that nearly every child who is sucking has his or her tongue white or “frosted” as it is sometimes called. The thrush may be mild or very severe. Now with regard to _What to do_.—As the thrush is generally owing to improper and to artificial feeding, _if the child be at the breast_, keep him, for a time entirely to it. Do not let him be always sucking, as that will not only fret his mouth, but will likewise irritate and make sore the mother’s nipple. _If he be not at the breast_, but has been weaned, then keep him for a few days entirely to a milk diet—to the milk of ONE cow—either boiled, if it be hot weather, to keep it sweet; or unboiled, in cool weather—fresh as it comes from the cow. The best medicine is the old-fashioned one of borax, a combination of powdered lump sugar and borax being a good one for the purpose: the powdered lump sugar increases the efficacy and the cleansing properties of the borax; it tends, moreover, to make it more palatable: Take of—Biborate of Soda, half a drachm; Lump-sugar, two scruples: To be well mixed together, and made into twelve powders. One of the powders to be put dry on the tongue every four hours. The best _local_ remedy is honey of borax, which ought to be smeared frequently, by means of the finger, on the parts affected. Thorough ventilation of the apartment must be observed; and great cleanliness of the vessels containing the milk should be insisted upon. In a bad case of thrush, change of air to the country is most desirable; the effect is sometimes, in such cases, truly magical. If the thrush be brought on either by too much or by improper food, in the first case, of course, a mother must lessen the quantity; and, in the second, she should be more careful in her selection.