HERD MILK Milk from a single cow is not to be desired for baby's food because of its liability to vary from day to day, not to mention the danger of the cow's becoming sick. Authorities have agreed that herd milk of Holstein or ordinary grade cows is best for infant feeding. This mixed-herd milk contains just about the proper percentage of fat; whereas, if Jersey milk must be used, some of the cream should be taken away. Our milk should come from healthy cows which have been tested for tuberculosis at least every three months. Annatto is sometimes added to milk to increase its richness of color. To test for annatto proceed as follows: To a couple of tablespoons of milk add a pinch of ordinary baking soda. Insert one-half of a strip of filter paper in the milk and allow it to remain over night. Annatto will give a distinct orange tint to the paper. The commonly used milk preservatives are boracic acid, salicylic acid, and formaldehyde, any of which may be readily detected by your health officials. SANITARY DAIRIES In close proximity to most large cities there is usually to be found one or more sanitary dairies. It is a joy indeed to visit a farm of this kind with its airy stables and concrete floors, which are washed with water coming from a hose. The drainage is perfect--all filth is immediately carried off (Fig. 11). The cows are known to be free from tuberculosis, actinomycosis (lumpy jaw), and foot and mouth disease. The milkmen on this farm wear washable clothes at the milking time, and their hands are painstakingly cleansed just before the milking hour. Previous to the milking the cattle have been curried outside the milking room and their udders have received a careful washing. The milkman grasps the teat with clean hands, while the milk is allowed to flow through several thicknesses of sterilized gauze into the sanitary milking pail. This milk is at once poured into sterile bottles, is quickly cooled and shipped in ice to the substations where the delivery wagon is waiting. In the ideal delivery wagon there are shallow vats of ice in which the bottles are placed, thus permitting the milk to reach the baby's home having all the while been kept at a temperature just above the freezing point. And why all this trouble? Why all this worry over temperature and cleanliness? Babies were not so cared for in the days of our grandmothers. The old-fashioned way of milking the cows with dirty clothes and soiled hands, while cattle were more or less covered with manure, with their tails switching millions of manure germs into the milking pail, produced a milk laden not only with manure germs--the one great cause of infantile diarrhea--but also swarming with numerous other mischief making microbes. Even tuberculosis, that much dreaded disease germ of early infancy, may come from the dairy hands as well as from infected cows.