THE ACTION OF ANTITOXIN UPON TOXIN. 



Numerous investigations concerning this problem 

 have shown, that the toxicity of a toxin decreases when 

 increasing amounts of antitoxin are added. The first 

 experiments of this kind with diphtheria toxin and with 

 tetanolysin were represented as a so called "toxin spec- 



1150 600 115 38 



60 70 SO 90 ton 110 120 130 



Fig. 3. 



trum'', which in the case of letanolysin had the form, 

 shown in fig. 3, but it was already then pointed out, that 

 the action of antitetanolysin upon tetanolysin should 

 rather be expressed by means of a continuous curve. 1 ) 

 During the last three years a very great number of 

 experiments with tetanolysin were undertaken, and at 



l) Th. Madsen 1. c. p. 226. 



