22 



From a careful study of this subject as presented in the foregoing 

 pages it seems that certain conclusions can be drawn which bear 

 important relations to the introduction, spread, propagation and 

 results of tuberculosis in this particular herd and which perhaps may 

 be with propriety applied in a general way to the extensive and 

 alarming prevaleuce of the disease among cattle in Massachusetts. 



1. That it is unsafe to purchase animals to add to a healthy herd 

 from a herd in which tuberculosis has existed. 



2. That poor sanitary surroundings, especiall}' imperfect ventila- 

 tion and insufficient light are favorable to the rapid spread of tuber- 

 culosis among cattle. 



3. That it is much better to dispose of excrement outside of 

 stables than in cellars underneath them. 



4. That mangers and other stable fixtures which increase the 

 amount of surface, cracks and corners that cannot be easily cleaned 

 are objectionable from the fact that when the germs of tuberculosis 

 become scattered, under such conditions they are not easily destroyed 

 by the use of disinfecting fluids. 



5. That infected stables bear close relation to the propagation of 

 the disease. 



6. That even by the use of strong disinfecting fluids it is very 

 difficult if not impossible to rid an old stable of the germs of 

 tuberculosis. 



7. That the diagnosis in most cases of this disease by physical 

 examination is impossible. 



8. 'Jhat in tuberculin we have an exceedingly delicate and reliable 

 test for tuberculosis. 



9. That tuberculin indicates the existence of tuberculosis in the 

 lungs and other parts of the body, when objective symptoms are 

 absent and when no germs can be discovered by microscopical exam- 

 ination of the mucus from the nostrils. 



10. That its use is not followed by any ill eflects of a serious or 

 permanent nature. 



11. That in some instances the injection of tuberculin produces 

 a marked rise of the internal temperature when no tuberculosis 

 exists. (Pledge of M. A. C, Beth Rainor and Marabell II.) 



12. That in some cases when tubercles are present in the body its 

 injection is not followed by a well defined reaction. (JNIeg.) 



13. That the reaction following the use of tuberculin bears no 

 relation to the extent or development of the disease. 



