31 



245 



The three sets of figures similarly imply thai a "zone of inhibited agglulin- 

 alion" occurred; but in these cases it was preceded by lubes either shewing or not 

 shewing agglutination, and followed by tubes shewing agglutination. 



In such cases, therefore, a standard degree of agglutination occurs twice (or 

 sometimes three times) on passing down the set of tubes. 



Table I. 



Table U. 



Culture: unliealec 



See the expl,iiialiiiii pieceeding Table 1. 



