CONTENTS. 
Preface 
Acknowledgment 
Ehrlich’s side-chain theory of immunity 
Phagocytosis 
Side chains 
Receptors 
The toxin molecule 
Haptophore group 
Toxophore group 
Toxoids 
Antitoxin. Free receptors 
Origin and distribution of receptors 
Cytolysins 
Amboceptors 
Complement 
Welch’s views 
The immunity unit 
Definition 
Roux’s method of measuring antitoxin 
Behring’s standard 
Ehrlich’s earlier methods 
The antitoxin unit 
The immunity unit 
The toxine as a standard of measurement 
The antitoxin as a standard of measurement 
The glycerinated serum 
The powdered serum 
The constitution of the toxine and its relation to antitoxin 
The toxin 
Prototoxin 
Deutrotoxin 
Tritotoxin 
The toxoid 
The toxone 
L° defined 
L— defined 
Minimal lethal dose (MED) defined 
‘ ‘ Spectra ” 
The toxone zone .. 
Views of Arrhenius and ^ladsen 
Von Dungern’s conclusions 
Calcar’s proof of the duality of toxin and toxone 
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