452 



MILK 



after about six weeks. Injections are usually made subcutane- 

 ously in front of the shoulder. 



The tuberculin reaction is considered an anaphylactic phenome- 

 non. The "sensitizing" dose is the result of broken-down cells of 

 the tubercle bacillus. Therefore if the animal is diseased the injec- 

 tion of tuberculin is the "intoxicating" dose which brings on the 





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temperature reaction. If the animal is free from tuberculosis 

 there will be no reaction following the injection of tuberculin. 



Tuberculin is sometimes injected intradermally instead of 

 subcutaneously. Haring and Bell claim that the intradermal 

 method, which depends upon a local swelling and not on a rise 

 in teniperature, is preferable to the subcutaneous method under 

 conditions that may modify the temperature curve, such as hot 



