Biological Papers. 143 



Gentlemen, the milk of cows that would produce this condi- 

 tion in hogs was sold for human consumption. We know that 

 hogs can eat that which man cannot. 



The other instance was that of the local country butcher 

 having no inspection in an adjacent village, and who fed the 

 lungs and other offal of the few animals he slaughtered to his 

 omnivorous hogs. One hundred per cent, of his hogs showed 

 equally bad intestinal tuberculosis. Several other dairymen 

 and local slaughter-houses revealed the same conditions, to a 

 lesser degree. Unless conditions are positively known to be 

 otherwise, the very same conditions may exist in any commu- 

 nity in the United States. 



It is an actual and indisputable fact that if every tubercu- 

 lous germ that has been given off or will be given off from the 

 tuberculous people and animals living at the present time 

 could be secured and effectually destroyed, or be merely pre- 

 vented from entering a living body, the last death that would 

 occur from tuberculosis would be in a person or animal in the 

 present generation. I have shown it to be within the will- 

 power of educated tuberculous persons to prevent infecting 

 other persons and be their brother's keeper rather than de- 

 stroyer. 



Since domestic food-animals have very little mental power, 

 it follows that the disease must be completely eradicated from 

 them. Cattle do not expectorate — they slobber and swallow 

 instead. The germs thus coughed up from the lungs are swal- 

 lowed and those that are not again reabsorbed are passed out 

 with the faeces. Farmers have found it economical to have 

 hogs secure a portion of their nutrition from the fseces of the 

 cattle. 



When the cattle are tuberculous the hogs also acquire the 

 disease. Thus tuberculous hogs are an index to dangerous 

 tuberculous cattle and other tuberculous hogs. 



It has been claimed recently that when the manure of tuber- 

 culous cattle dries within the stable it becomes dust, and por- 

 tions of it, together with tuberculous germs, drop into the 

 milk, which, if still retained at the temperature of the cow, 

 offers the finest of opportunities for the tuberculous germs to 

 grow, live, and multiply. A. few germs at the time of milking 

 may become several hundred at time of drinking. 



The methods by which tuberculosis is transmitted from one 

 animal to another or from one species to another can be re- 



