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it. There are two species closely related to Pfeiffer's bacillus 

 which in my experience and that of other authors, are not 

 so intensely haemoglobinophilic as the latter, and which differ 

 from it in a number of other ways: (2) the haemolytic 

 haemoglobinophilic bacteria and (3). B. haemo- 

 globinophilu s canis. 



Other groups of haemoglobinophilic bacteria are not 

 known. But in a few cases strains of bacteria have been 

 described (always bacilli) that with more or less propriety 

 are termed haemoglobinophilic, though they have not been 

 sufficiently examined to make it possible to determine their 

 relationship jto the groups mentioned and other bacterial species. 

 It has not been proved that an organism has been discovered 

 which is just as intensely and permanently haemoglobinophilic 

 as Pfeiffer's bacillus. 



