VI 



tinating power of equal strength immediately after the 

 injection. 



Curve No. lOa concerns 4 rabbits of about the same 

 size (20002320 gr.). Rabbit * and T got each 12,5 cc. 

 typhoid agglutinin from rabbit, p and ?, each 5 cc. ty- 

 phoid agglutinin from goat. Preceding experiments had 

 shown, that these 5 cc. goat serum contained exactly 

 the same agglutinating power as the 12.5 cc. rabbit 

 serum, and as it appears from the curve the 4 rabbits 

 from reached about the same point, a 37, ( and 5 

 33,2, and p 28,5. The rabbits and y, which had both 

 got rabbit serum, kept their agglutinin for a compa- 

 ratively long time 30 and 38 days. 



The other two animals p and ? on the contrary, which 

 were injected with goat serum, had already lost their 

 agglutinin on the 9th resp. to the 16th day. 



This makes it probable that the typhoid agglutinins 

 from goat and rabbit are different. 



From these experiments it seemed at first justifiable 

 to conclude that we had to deal with a law by which 

 it appeared, that the agglutinins of animals of one spe- 

 cies always acted as foreign matters, when introduced 

 into the fluids of another species and, as such, at once 

 rapidly disappeared, whereas the agglutinin from an 

 animal of the same species was partly retained for a 

 comparatively long time. As it is well known this view 

 was put forward by Behring some years ago concerning 

 the antitoxins. 



In the case of agglutinins this supposition must be 

 abandoned in the light of further experimentation. For 

 this served 4 goats, (curve No. lOb). On the 19 / 6 ^ vas 

 introduced intravenously on goat II 14 cc. typhoid agglu- 

 tinin (from goal) and on goat I 35 cc. typhoid agglu- 

 tinin (from rabbit). 



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