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FlG. 111. TlTRATION OF ANTIGEN FOR ANTICOMPLEMENTARY UNIT. 



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FlG. 112. TlTRATION OF ANTIGEN FOR ANTIGENIC UNIT. 



In Fig. Ill the tube containing 1.5 c.c. of antigen shows slight inhibition of 

 hemolysis, and this amount is the anticomplementary unit. 



In Fig. 112 the tube containing 0.15 c.c. of antigen is the smallest amount pro- 

 ducing complete inhibition of hemolysis, and is the antigenic unit. 



