36 



MODERN BIOLOGIC THERAPEUSIS 



of toxin and antitoxin. Arrhenius and Madson 

 consider that these substances are partly disso- 

 ciable compounds resembling a weak acid and 

 a weak base, and that the reaction between the 



Claude Bernard (1813-78). 



two is reversible their union depending upon 

 an excess of free toxin and antitoxin in the solu- 

 tion. The quantitative relations between the 

 two are thus covered by the law of mass action. 



