DISEASES OF THE LOWER ANIMALS 



of the organisms as the important factor. In- 

 oculations with killed bacilli did not produce 

 results; inoculations with vigorous tubercle 

 bacilli, of course, would cause tuberculosis in 

 the inoculated animal. The complete absorp- 

 tion of the organisms was also found to be an 

 important factor. Administration of the bac- 

 teria by mouth conferred only a temporary im- 

 munity, the younger the animal the better the 

 immunity. Vaccination by mouth permitted 

 young cattle to resist for one and two years 

 fatal infection when they were stalled in close 

 contact with cows with advanced lung tuber- 

 culosis, while the control cattle, not thus vac- 

 cinated, rapidly contracted the disease. There 

 is every reason to believe that the methods now 

 being worked out to control tuberculosis in ani- 

 mals will be applicable to man. 



It is not the launching of dreadnoughts, the 

 rise and fall of cabinets, political intrigues, or 

 the foot-ball game that are of the greatest im- 

 portance to mankind, but such work as this, 

 carried on without ostentation, with infinite pa- 

 tience, by earnest and devoted men, whose best 

 reward is the assurance of their own hearts 

 that they have done well. It is such as these 

 who are to redeem the world, not they who 



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