262 LECTURES ON IMMUNITY 



Morgenroth and Sachs. The total quantity was 2.2 c.c. 

 The tabulated quantity is the degree of haemolysis. 



The action is the least in Ser. 2, after this comes Ser. 3, 

 then Ser. 4, and last Ser. I. It seems difficult to explain 

 this peculiar behaviour, which was controlled by other 

 measurements, so long as we suppose that the "antialexin" 

 entered into combination only with the alexin present. 

 The observations may be understood if we assume that 

 either an anti-immune-body or an antihaemolysin was pres- 

 ent. If we suppose that the preparation c contained anti- 

 immune-body as well as antialexin and their affinities are 

 strong, then small quantities of c may be sufficient for the 

 neutralisation to a remarkable degree if small quantities of 

 either the alexin (Ser. i) or of the immune-body (Ser. 4) 

 are present. The explanation is analogous (the result 

 of the partial dissociation) if we suppose the presence of 

 an antihaemolysin in the solution c. 



In any case the reactions in the presence of antialexins 

 or anti-immune-bodies are rather complicated and difficult 

 of survey. 



