220 



TUBERCULOSIS 



THE INITIAL TEMPERATURE OF TWO COWS, WITH RATE OF PUI.SE 

 AND NUMBER OF RESPIRATIONS PER MINUTE. 



In view of these normal temperature variations, which 

 often exceed the tuberculin reaction, it is obvious that before 

 applying the test the normal temperature of the animals should 

 be approximateh- determined and that when they are being 

 subjected to the test they should be cautiously protected, 

 otherwise the comparatively slight elevation necessary to detect 

 the disease may be disguised. 



As the reaction seems to be the result of an affinity exist- 

 ing between the tuberculin and the living tuberculous lesion, 

 it is natural to suppose that when the two are brought together 

 in the same animal it would invariably take place. Experience 

 has shown that it almost always does. It is important to 



