Among the questions dealt with by sanitary authorities there is no other of greater importance than the one concerning the production and distribution of a supply of pure, clean milk. Many of the features of the vast question of food adulteration are being met by our national government in its regulation of interstate commerce. Of necessity, however, these laws can control the transportation only of the less perishable articles of food, and the responsibility of the milk supply of a community must be left almost entirely to the local authorities. From the time when each family kept its own cow or depended for its supply of milk on a local farmer, to the present situation, when the big cities depend on a supply drawn from thousands of dairies scattered over wide areas, is a far cry.
This change has come about so insiduously and cities have grown with such astonishing