66 



ATLAS OF BACTERIOLOGY. 



The following definition will suffice, perhaps, for 

 the practical requirements of bacteriology : 



Small unbranched * cells (almost f) always free from 

 chlorophyll, with a thickness which is hardly ever 

 more than 2 /*, and extremely rarely 3-5 P- ; they have 

 a globular, rod, thread, or screw shape, without any 



FIG. 1. The Forms of Bacteria according to Buchner. 



other organs than flagella which serve for movement. 

 Vegetative proliferation takes place by transverse 



* Concerning our knowledge of branched bacteria, vide pp. 67 

 and 68. 



f Practically important bacteria containing chlorophyll are un- 

 known. But J. Frenzel's green tadpole bacillus must probably 

 be classed among the schizomycetes. The position of Dangeard's 

 eubacillus multisporus among the bacteria seems more doubtful, 

 L. Klein described colorless forms with bluish-green spores. 



