414 



ALFRED H. RAHE 



TABLE 2— Concluded 



mannite. The disparity in numbers between the bacillus A 

 and the next most numerous member of this group hints that 

 we may be dealing with a main type and its variants. Plausi- 

 bility is given to this suspicion by the progressive nature of the 

 assumed lapses in character. The diagram below will illustrate 

 this point. 



B. acidophil-aerogenes A 

 (Gas in all test-substances) 



B. acidophil-aerogenes G 



(No gas in lactose) 



B. acidophil-aerogenes H 

 (No gas in sucrose) 



B. acidophil-aerogenes B 

 (No gas in raffinose) 



B. acidophil-aerogenes C 

 (No growth in raffinose) 



B acidophil-aerogenes D 

 (No gas raffinose and lactose) 



B. acidophil-aerogenes E 

 (No growth in raffinose and lactose) 



B. acidophil-aerogenes F 



(No growth in raffinose, lactose 

 or sucrose) 



The diagram represents observed "lapses" only. More extended observa- 

 tions are necessary if the sequence is to be correct. There might be found, 

 for example, the bacillus intermediate between E and F; i.e., one that grows 

 in sucrose but does not produce gas and does not grow in raffinose and lactose. 



