TRANSMISSIBILITY OF TUBERCULOSIS THROUGH MILK.

Considerable positive evidence exists of the danger from use of milk derived from tuberculous cows, whether the udders are involved in the disease or not. Tubercle bacilli have been found not alone in such milk, but also in butter and cheese prepared therefrom. Additional evidence of a confirmatory character is supplied by the report recently issued by the director of the Jenner Institute of Preventive Medicine¹ to the effect that of one hundred samples of milk submitted from the Hackney District, seventeen contained tubercle bacilli of virulent character, as determined by animal inoculation. The tests with regard to twenty-three other of these specimens were not satisfactory. As it is not always easy to determine or to recognize the existence of tuberculosis in cows, it is a wise precaution to boil all milk intended for consumption. When the disease is known to exist in animals, their milk should not be