The above mode of treatment is appropriate to cases of what may be termed the indigestion of debility, but a different plan must be adopted in those instances in which it depends on some other cause. The rule, indeed, which limits the quantity of food to be given at one time is no less applicable here, for the rejection of some of the milk may be the result of nothing more than of an effort which nature makes to reduce the work that the stomach has to do within the powers of that organ. But when, notwithstanding that due attention is paid to this important point, uneasiness is always produced by taking food, and is not relieved till after the lapse of some twenty minutes, when vomiting takes place, or when the infant suffers much from flatulence and from frequent acid or nauseous eructations, it is clear that the symptoms are due to something more than the mere feebleness of the system. It is not, however, the mere fact that the child vomits its food, or of the milk so vomited being rejected in a coagulated state, which proves that the stomach is disordered, but it is the fact of firmly coagulated milk being rejected with much pain, and after the lapse of a considerable interval from the time of its being taken, which warrants this conclusion. The coagulation of the curd is the first change which the milk of any animal undergoes when introduced into the stomach. The coagulum of human milk is soft and flocculent, and not so thoroughly separated from the other elements of the fluid, as the firm hard coagulum or curd of cow's milk becomes from the whey in which it floats. In a state of health the abundantly secreted gastric juice speedily redissolves the chief part of the curd in the stomach, while when it has passed into the intestine the alkaline bile which there becomes mixed with it, completes its solution, and converts the whole into a fluid which closely resembles one of the chief elements of the blood, is consequently very easily taken up by the minute vessels whose office it is to do so, and thus supplies with nourishment the whole body.