THEORIES OF IMMUNITY. 



reaction just spoken of, and this has been found 

 as follows : 



Let H represent the haptophorous atom-group, 

 T represent the toxophorous atom-group, 

 and X represent the remainder of the atom- 

 groups in the molecule. 



Then the toxine molecule =H+T+X, 

 and the antitoxine molecule =H+X. 



When two such molecules come together, the 

 haptophorus groups will combine by reason of 

 the affinity they have for each other, and the 

 result is the inability of the toxine to effect 

 further or different combination, so that its tox- 

 ophorous groups will be unable to exert any 

 hurtful influence : the combination would appear 

 thus : /H+T+X 



\H+X 



The production of the antitoxine may be 

 illustrated in very much the same way, except 

 that here the reaction lies between the toxine 

 molecules and those having the same haptopho- 

 rous groups in the tissue cells. 



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