BACTERIA tO0 



who is a trained botanist. This system, with sight modifications, is 

 given below. In this system, the characters which separate the 

 genera are morphological; while physiological characters, including 

 cultural, are used for the differentiation of species and smaller groups. 

 One of the rules adopted by systematists in other lines is the binomial 

 rule. In the violation of this rule, bacteriologists have been great 

 sinners, and some of the names proposed by Migula and others follow- 

 ing his system are quite different from those by which well-known forms 

 have been christened by their discoverers. 



CLASSIFICATION OF MIGULA '(MODIFIED) 



The bacteria are phycochrome-free schizomycetous plants which divide in one, 

 two, or three planes. Reproduction takes place by vegetative multiplication (fission). 

 Resting stages in the form of endospores are produced by many species. Motility is 

 noted in some genera, and this is due to flagella. In Beggiatoa and Spirochseta the 

 organs of locomotion are not definitely known. 



I. Order: Eubacteria (true bacteria). 



The cells are devoid of any nucleus (ZentralkSrper) and free from sulphur and! 

 bacteriopurpurin, colorless or faintly colored. 



I. Suborder: Haplobacterinse (lower bacteria). 



I. Family: Coccaces (Zopf) Mig. 



The cells are globular when in a free state, but in the various stages of division 

 appear somewhat elliptical. A few species in this family are motile. . Cell division 

 takes place in several directions of space. Frequently the cells remain attached to- 

 gether, and under these conditions usually show some flattening of the cell at the 

 point of junction with the cell next to it. 



Genus: Streptococcus Billroth. 



The cells are globular and do not possess any organs of locomotion. Cell division 

 takes place in only one plane. Usually the cells remain united together after 

 division, producing chains or diplococcus forms. No endospores have beeii noted. 



Genus: Micrococcus (Haxlier) Cohn. 



The cells are globular and do not possess any organs of locomotion. CeU division 

 takes place in two planes at right angles. If the cells remain attached together after 

 cell division, merismopedia plates are formed. . The plates give the appearance of a 

 regtdar flat mass of cells. No endospores have been noted in this genus. 



Genus : Sarcina Goodsie. 



The cells are globular and do not possess any organs of locomotion. Cell division 

 takes place in three planes, all perpendicular to each other. Its cells remain attached 

 after division; cube-like packets are formed. The composition of the medium £ome- 

 times prevents this typical cube formation. 



Genus : Planococcus Migula. 



The cells are globular. CeU division takes place in two planes at right angles 



