Bacteria 



35 



been given. Migula uses the term Micrococcus for the unflagellated 

 tetrads, and Planococcus for the flagellated forms. 



If division takes place in three directions of space, so as to pro- 

 duce a cubic "package" of cocci, the resulting aggregation is de- 

 scribed as a Sarcina. This form resembles a dice or a miniature 

 bale of cotton. Few sarcinas have flagella, similar flagellated 

 organisms being called by Migula Planosarcina. > ' 



If division always take place in the same direction, so that the 



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sU^ 

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/ 



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I 



Fig. 4. — Various forms of bacilli (Kolle andWassermann). 



cocci remain attached to one another like a string of beads, the 

 organism is described as a Streptococcus. 



Cocci commonly occur in irregular groups having a fancied re- 

 semblance to bunches of grapes. Such are called Staphylococcus, 

 and most organisms not finding a place in the varieties already de- 

 scribed are so classed. 



Cocci associated in globular or lobulated clusters, incased in a 

 resisting gelatinous, homogeneous mass have been described by 

 Billroth as Ascococcus. Cocci solitary or in chains, surrounded by 



