In the earlier attempts to diminish tuberculosis, the prevention of infection by means of food bulked very largely. The only foods which are of importance in this connection are cows' milk and its products, and the flesh of the ox and pig. Inasmuch as cows' milk is the chief possible non-human source of tuberculosis in man, the question becomes in the main one as to the relation between bovine and human tuberculosis. This chapter estimates the extent of infection by the milk and flesh of tuberculous cattle and the butter made of this milk, as hardly greater than that of hereditary transmission. In England a Royal Commission was appointed to inquire into the relations of human and animal tuberculosis, and in 1904 it issued an interim report, from which the following extract is taken. The bovine bacillus is more uniform and constant in form than the human bacillus.