24 GENERAL SYSTEMATIC BACTERIOLOGY 



dd. Filaments cylindric, with phycochrome, definitely jointed. 

 Reproductive cells unknown. 



Hypheothrix Kg. 

 Oscillaria Bosc. u. a. 

 3d. Filaments cylindric, jointed, forming gonidia. 



e. Colorless Crenothrix Cohn 



ee. With phycochrome Chamaesiphon u. a. 



4d. Filaments spiral. 



e. Without phycochrome. 



f. Filaments short, slightly wavy. 



VibiHo Ehr. em. 

 ff. Filaments short, spiral, stiff. 



Spirillum Ehr. 

 fff. Filaments long, spiral, flexuous. 



Spirochaete Ehr. 



ee. With phycochrome Spirulina Link 



5d. Filaments rosary like. 



e. Colorless Streptococcus Billr. 



ee. With phycochrome Anabaena Bory. 



6d. Filaments tapered to tip Spermosira Kg. u. a. 



cc. Filaments united together into slimy families. 



d. Filaments cylindric, colorless. Myconos<oc Cohn 

 dd. Filaments cylindric, with phycochrome. 



Chthonoblastus-Limnochlide 



3d. Filaments rosary like Nostoc, Hormosiphon u. a. 



4d. Filaments tapering to tip Rivularia Roth 



bb. All filaments with false branches. 



c. Filaments cylindric, colorless Cladolhrix Cohn 



Streptothrix Cohn 

 cc. Filaments cylindric, with phycochrome. 



Calothrix Ag. 



3c. Filaments rosary like Merizomyria Kg. 



4c. Filaments tapering Schizosiphon Kg. 



It will be noted that the following bacterial genera were new, 

 Ascococcus (species A. Billr othii), Streptococcus (erroneously ascribed to- 

 Billroth, even here without a species designation and probably therefore 

 invalid) Myconostoc {M. gregarium), Cladothrix (sp. C. dichotoma, name 

 invalid because earlier used for another genus of plants), Streptothrix 

 {Str. Foersteri, generic name invalid because of previous use of this 

 generic name for a genus of fungi) . 



It has been suggested that if a date for a point of departure for the 

 classification of bacteria is to be fixed it might well date from this 

 1875 classification of Cohn. 



In 1877 the veterinarian Bollinger sent to the botanist Harz purulent 

 material from a case of "lumpy jaw" in a cow. Harz found present 



