ANAPHYLAXIS 



293 



blood. The iact that an animal which has once reacted 

 fails to do so until several months afterward likewise depends 

 on the fact that the excess enzyme is used in the reaction 

 and time must elapse for a further excess to accumulate. 



The anaphylactic reaction has been made use of in the 

 identification of various types of proteins and is of very 

 great value, since the reaction is so delicate, particularly 

 when guinea-pigs are used as test animals. Wells has 

 detected the 0.000001 g. of protein by this test. It is 

 evident that the test is applicable in medico-legal cases 

 and in food examination and has been so used. 



A Tabulation of Antigens and Antibodies as at 

 Present Recognized. 



