68 GENERAL SYSTEMATIC BACTERIOLOGY 



3. Bad. aerogenes group, very near B. colt (but non-motile?). 



Pathogen: Bad. dysenteriae. 



4. Plague and septicemia group. Non-motile, polar staining. Gram 



negative, do not liquefy gelatin. 

 Pathogen: Bad. pestis. 



5. Influenza group. Very small. Gram—, growing only on media 



containing hemoglobin. 

 Pathogen : Bad. influenzae 



6. Swine erysipelas group. Very small rods, do not liquefy gelatin. 



Gram positive. 



Pathogen: Bad. Rhusiopathiae, Rabbit septicemia. 



7. Glanders group. Very slender rod. Gram negative. 



Pathogen: Bad. mallei. 



8. Diphtheria group. Gram positive. Tendency to the production 



of club shaped involution forms and to granular disintegration. 

 Pathogen, Bad. diphtheriae, Bad. xeroseos. 



9. Acid fast group. Producing slimy wrinkled layers on the surface 



of solid and liquid media. Gram positive and acid fast. 

 Pathogen: Bad. tuberculosis. 

 III. Spirillaceae: Cells spiral. 



A. Family Vibrio. All comma-shaped, bent, fission fungi with polar 



flagella. Often united to spirals. Gram negative. 

 Pathogen: ]'ibrio cholerae asiaticae. 



B. Family Spirillum. Several corkscrew turns. Polar flagella. Many 



saprophytes. 

 Pathogens: None known. 



The classification of the Trichomycetes or thread bacteria suggested 

 by Jordan (1908) is worthy of note. He diagnosed the genera as 

 follows : 



Jordan's Classification of the Trichomycetes (1908) 



1. Filaments unbranched Leptothrix 



2. Filaments with pseudobranches Cladothrix 



3. Filaments with true branches. 



a. Reproductive elements, spores observed . . . Nocardia 



b. No spores observed Actinomyces 



Conn (1909) suggested the following classification: 



Conn's Classification of Bacteria (1909) 



Spherical Bacteria: 



Dividing in one plane, so as to form chains. Streptococcus. 



Dividing in two planes, and not forming chains. Micrococcus. 



Dividing in three planes, and forming cubical masses, Sarcina. 

 Rod Shaped Bacteria: 



With flagella, and consequently motile, Bacillus. 



