44 GENERAL SYSTEMATIC BACTERIOLOGY 



Baumgarten's Classification of Bacteria (1890) 



A. Species relatively monomorphic. 



I. Cells spherical Genus Kokkus 



a. Cells in pairs Subgenus Diplokokkus 



b. Cells in chains Subgenus Streptokokkus 



c. Cells in tabular masses. . .Subgenus M crista or Merismopedia 



d. Cells in regular packets . .Subgenus Sarcina 



e. Cells in irregular masses . Subgenus Mikrokokkus 

 II. Cells rod shaped. Many species with spores. 



Genus Bacillus 



III. Cells spiral Genus Spirillum 



Subgenera Subgenus Vibrio 



Subgenus Spirillum 

 Subgenus Spirochaete 



B. Species relatively pleomorphic. 



I. Rods and spirals. Proteus types. 



Genus Spirulina 

 II. Long filaments. 



a. Unbranched Genus Leptothrix 



Subgenera Subgenus Leptothrix 



Beggiatoa 



Crenothrix 



Phragmidiothrix 



b. Branched Genus Cladothrix 



The Comil-Babes (1890) classification is another example of the 

 carelessness in the definition of genera frequently to be found among the 

 writers on medical bacteriology. The following outline will give the 

 principal groups recognized, although generic names not here mentioned 

 are used in the body of the text. 



Comil-Babes' Classification of Bacteria (1890) 



Group I. Micrococcus. Cells spherical. 



1. Cells in rosary Streptococcus 



2. Cells in irregular groups Staphylococcus 



3. Cells in firm gelatinous masses. . .Ascococcus 



4. Cells in regular packets Sarcina 



Group II. Bacteriaceae. Short rods usually, may develop to filaments. 



1. Without capsules. 



a. Not polymorphic Bacterium 



b. Polymorphic Proteus 



2. Encapsulated Ascobacterium 



Group III. Bacilli. Longer rods, producing spores. Genera Bacillus and Vibrio. 

 Group IV. Spirobacteria. Cells spiral. 



Genera Spirillum, Spirochaete, Leptothrix, Beggiatoa, Streptothrix. 



