12 BACTERIOLOGY. 



defined. Conversely, the young daughter cells 

 are smaller and consequently less distinct 

 (Fig. 3). The value, then, of the individual 

 shapes fluctuates very greatly. At times it is 

 the transitory division form, at times the com- 



Fig 3. Bacterium Zopfii (after Kurth). A, Short rods in process 

 of division into arthrospores, d. B, Longer rods. C, Curved 

 threads or filaments, in part segmented. Z), Straight filaments 

 in part segmented. E and F, Twisted filaments and coils. G 

 and H, Spiral forms. /, Germination of the arthrospores. 



mon mature form that is deemed " typical." 

 Only as applied to the mature forms does the 

 above grouping hold good. On this account it 

 is superfluous, at least in the beginning, to de- 

 termine with rule and compass the " regula- 

 tion " length or breadth of a species, while gen- 

 eral morphological questions remain unsettled 

 which are plainly of more consequence. 



It must be remarked furthermore that even 



