ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 217 



of B. zopfii. He found that by placing the cultures on a rotating wheel 

 this peculiar character was lost, and he therefore ascribes the feathery- 

 looking growth to geotaxis. 



Types of Bacilli of the Dysentery Group.* — Y. K. Ohno ex- 

 .amined 7-i strains of B. dysenterm, which, according to their fermenting 

 action, he subdivided into 15 types. Experiments are also adduced as 

 to the agglutinating action and the bacteriolytic action towards immune 

 sera. Of these 15 groups nine fermented mannite and six did not (acid 

 and non-acid forms). There was no correspondence between ferment 

 groupings and the agglutinative and bacteriolytic action ; thus, rab1)it 

 sera prepared from non-fermenting bacilli would agglutinate fermenting 

 bacteria, and vice versa. Similarly, there was crossed bacteriolysis. 

 The general conclusion arrived at is that dysentery bacilli cannot be 

 divided into two groups, the acid and non-acid, and disclaims the notion 

 that if a bacillus cause dysentery it should be designated a pseudo- 

 dysentery bacillus. The 15 types he describes as forming one group. 



* Philippine Journ. Science, i. (1906) pp. 951-76. 



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