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the domestic animal, was one and the same. Professor Koch, the 

 discoverer of the tubercular bacillus, as well as of the diagnostic 

 agent. Tuberculin, however, startled the world in igoi, when he made 

 it known at the congress on Tuberculosis, held in London, that he 

 had failed to infect animals with tuberculosis when they had been 

 inoculated with the human bacilli, and, that after various experi- 

 ments, he "felt justified in maintaining that human tuberculosis 

 differs from bovine, and cannot be transmitted to cattle." Although 

 not an experimenter, I have for years thought and said that there 

 must be some great difference between the two. My reason for 

 holding this opinion was, that farm servants, — both male and female, 

 who worked among, and tended cattle so affected, and who often 

 drank quantities of milk in a warm state, which they had newly drawn 

 from the udders of tubercular cows, — are healthy people, and, as a 

 class, it would be difficult to find another, so free from consumption. 

 Further, I know a number of butchers who trade in these tubercular 

 animals, who have not only told me that they have eaten, but I have 

 seen them eat the flesh of tubercular carcases, both raw and cooked, 

 without taking any harm, in fact, they are splendid specimens of 

 healthy subjects. 



543. With reference to the hereditary nature of the disease. 

 Professor Koch says "though hereditary tuberculosis is not absolutely 

 non-existent, it is nevertheless extremely rare," and again he says " I 

 should estimate the extent of infection by the milk and flesh of 

 tubercular cattle, and butter made from their milk, as hardly greater 

 than the hereditary transmission." While agreeing with him on the 

 milk and meat question, my experience leads me to differ with him 

 respecting the hereditary tendency of the malady. Calves are born 

 tubercular, and the problem to be solved is, how do they become 

 affected ? It cannot be by direct ingestion or inhalation. Again, 

 how can the fact be explained, that the disease is known to run in 

 certain families of the human subject for generations, such families 

 cohabiting with other families that remain free, and the same holds 

 good in certain bloods of cattle. If the disease itself is not directly 

 transmitted at conception, then, perhaps a hereditary diathesis, or a 



