ANTITOXINS 



It was natural to suppose, as the early investi- 

 gators did, that a just neutral mixture of toxin and 

 antitoxin, would require the addition of but one 

 fatal dose of toxin in order to regularly kill the test 

 animal. In the above table, however, we see that 

 this difference ranges from six to fifty fatal doses. 



Partial Saturation Method - - Toxons, Toxoids. - 

 Ehriich obtained considerable additional informa- 

 tion by means of his " partial saturation " method. 

 Certain experiments had led him to believe that the 

 original antitoxin on which he had based his " unit " 

 determinations, while able to neutralize 100 fatal 

 doses (per unit) really represented 200 " binding 



