IULK 



after about six wwfcs. Injections are usually made subcutane- 

 ously in front of the shoulder. 



Hie niberculin reaction is considered an anaphylaetic phenome- 

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

 the tubercle bacillus. Therefore if the animal is diseased the in j ee- 

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



temperature reaction. If the animal fe free from ruberculos 

 there wifl be no reaction f oDowing the injection of tuberculin. 



Tuberculin is sometimes injected intradennaDy instead of 

 subcutaneoreiy. Haring and Bell claim that the intradermal 

 which depends upon a local swelling and not on a rise 

 is preferable to the subcutaneous method under 

 may modify 



