7 6 



SPECTRA OF TOXINS 



Thirdly, there is tvitotoxin, again in an a and a /3 modification, 

 with less affinity for antitoxin than deuterotoxin, and so are placed 

 on its right in the spectrum. 



It is found, further, that the proportion of a modification to 

 P modification in the above forms of toxin is a simple one, 

 so that the ratio of toxoid to toxin present in any one part of the 

 spectrum is always simple (-J, ^, ^, etc.). 



Fourthly, there is toxon (toxone) or epitoxoid, the characters of 

 which we have seen. 



Lastly, some researches seem to prove that there is yet 

 another body, epitoxonoid, which has still less affinity for antitoxin 

 than has toxon, and which is entirely devoid of lethal or toxic 

 power. It will be left out of the further consideration of these 

 bodies. 



The spectrum of a toxin on this theory is recorded thus : 



Profofaxo/clA 



Trifofoxoicf A 



Toxon 



Profotoxin B Deuterotoxin B Tritotoxin B 



FIG. ii. 



The spectrum of the example given by Madsen and quoted 

 above would be : 



FIG. 12. 

 Another spectrum, given by Ehrlich, is appended : 



DeuferotoxinB Tritoxoxm B 



FIG. 13. 



We must now turn to the experimental results which have led 

 to this idea of the change of the toxin into toxoid ; it has been 



