It is quite generally held that the presence of hard protein curds in the stools from bottle fed infants is indicative of a faulty digestion of the casein fed in the modified cow's milk formulas.1 Such a view seems to confuse the issue, placing on the baby a fault which should be borne by the person under whose direction the modified milk formulas are prepared, as Brennemann2 has clearly demonstrated in four cases in which he was able to produce curds in infants' stools and make them disappear at will by manipulation of the food.
The chemical composition of these hard curds leads me to believe that they are not produced as the result of any fault in the digestive functioning of the infant but that they are produced by a normal digestion, functioning on an unnatural food which is only partly modified to a condition adaptable to