358 MICRO-ORGANISMS AND DISEASE [chap. 



Dr. Sidney Martin and Dr. Sims Woodhead they arrived 

 unanimously at the following conclusions (p. 20) : 



" We have obtained ample evidence that food derived 

 from tuberculous animals can produce tuberculosis in 

 healthy animals. The proportion of animals contracting 

 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 food- 

 animals. 



" 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 an appreciable part of the tuberculosis that affects 

 man is obtained through his food. 



" 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 tuberculous matter in the food taken from the 

 animal and consumed by the man in a raw or insufficiently 

 cooked state. 



" Tuberculous disease is observed most frequently in 

 cattle and in swine. It is found far more frequently in 

 cattle (full grown) than in calves, and with much greater 

 frequency in cows kept in town cow-houses than in cattle 

 bred for the express purpose of slaughter. Tuberculous 

 matter is but seldom found in the meat substance of the 

 carcase, it is principally found in the organs, membranes, 



