182 



It will be seen that it is practically only in the homologous reac- 

 tions that agglutination occurs. 



This experiment was made with 61 hour cultures. At the 

 same time 45 hour, 36 hour and 17 hour cultures were tested with 

 exactly the same results, apart from the fact that the reactions in 

 which the younger cultures took part were difficult to read on 

 account of the greater tendency to spontaneous agglutination. 



The following absorption experiments were then carried out 

 with serum I 6: 



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