BACTERIA. 



79 



ale 



FIG. 16. 



Crenothrix Kiihniana, after Zopf : ae (600 : 1), cocci in different stages of 

 division; / (600: 1), small, round cocci-zoogloea ; g (natural size), 

 zoogloea ; h (600 : 1), colony of short filaments composed of rod -like 

 cells, originating from the germination of a small collection of cocci : 

 i r, filaments, partly straight, partly spirally curved (I, m}, of very 

 varying thickness, with more or less pronounced contrast between the 

 the base and apex, and different stages of the division of their members 

 and sheaths ; the sheathed filament r shows short rods at the base, which 

 higher up are divided into small cylindrical pieces ; at the apex the 

 cocci are seen arising from the longitudinal divisions of the cylindrical 

 discs. 



