30 



MICROBIOLOGY 



Streptoccccua- 



microccccus .. .... 



These two authors placed the bacteria among the infu- 

 soria. Zoph divided bacteria into four groups, namely : the 

 Coccaceae five genera, Bacteriaceae six genera, Leptitrich- 

 eae four genera, and Cladotricheae one genus. De Bary 

 divided them into two groups, one producing endospores, the 

 other arthrospores. Baumgarten divided bacteria into two 

 groups, (1) the monomorphous and (2) the pleomorphous. 

 The first contained the micrococci, bacilli and spirilla; the 

 second the higher forms. Messea 7 , who classified bacteria 

 after their flagella, divided them into the 



ias classification I. Gymnobacteria 



^er Bacteria all bacteria without fla- 



gella. 



II' Trichobacteria 

 all bacteria with flagella 

 (motile). 



1. Monotricha bac- 

 teria with one flagellum 

 at one pole. 



2. Lophotricha bac- 

 teria with a bunch of fla- 

 gella at one pole. 



3. Amphitricha bac- 

 teria with flagella at each 

 pole. 



4. Peritriclia bac- 

 teria with flagella diffused 

 over the body. 



Of the numerous more 

 recent classification the 

 one by Migula 8 seems to 

 be the simplest and most 

 satisfactory when considered, from the point of view of 

 animal pathology, because it introduces so few new 



7 Messea. loc. cit. 



8 Migula. Die natiirlichen Pflanzenfamilien, 1896. 



Fig. 11. A diagrammatic scheme 

 of Migula's classification of lower 

 bacteria. 



