9K publk; abattoirs and the prevention, etc, 



and lungs will be infected by inlialation of the bacillus, and 

 tuberculous material being swallowed will infect the intestines, 

 causing ulceration, and affecting subsequently the mesenteric and 

 other abdominal glands, and possibly the entire organism. Of 

 infection by food, such as milk, ample evidence is forthcoming, 

 and there can be no doubt from experiments carried out on the 

 lower animals that meat may be also a fertile source of danger. 

 In the report of the Royal Commission on Tuberculous of 1895 

 the following appears : — " We have obtained ample evidence 

 that food derived from tuberculous animals can produce tuber- 

 culosis in healthy animals. The proportion of animals con- 

 tracting tuberculosis after experimental use of such food is 

 different in one and another class of animals ; both carnivora 

 and herbivora are susceptible, and the proportion is high in pigs- 

 In the absence of direct experiments on human subjects, we 

 infer that man also can acquire tuberculosis by feeding upon 

 materials derived from tuberculous animals." 



78. The actual amount of tuberculous disease among certain 

 classes of food-animals is so large as to afford to man frequent 

 occasions for contracting tuberculous disease through his food. 

 As to the proportion of tuberculosis acquired by man through 

 his food, or through other means, we can form no definite 

 opinion ; but we think it probable that a considerable part of 

 the tuberculosis that effects man is obtained through his food. 



79. The circumstances and conditions with regard to the 

 tuberculosis in the food-animal which lead to the production of 

 tuberculosis in man are ultimately the presence of active tuber- 

 culous matter in the food taken from the animal and consumed 

 by man in a raw or insufficiently cooked state. 



80. " Tuberculous disease is observed most frequently in 

 cattle and swine. . . . Tuberculous matter is but seldom 

 found in the meat substance of the carcase, it is principally 

 found in the organs, membranes, and glands. There is reason 

 to believe that tuberculous matter, when present in meat sold to 

 the public, is more commonly due to contamination of the 

 surface of the meat with material derived from other diseased 

 parts, than to disease of the meat itself. The same matter is 

 found in the milk of cows when the udder has become invaded 

 by tuberculous disease, and seldom or never when the udder is 

 not diseased. Tuberculous matter in milk is exceptionally active 



