64 MICRO-ORGANISMS AND FERMENTATION. 



bit of this young film is transferred to fresh nutritive liquid at 

 40-4<0y C., the cells grow into long threads in a few hours (Fig. 

 17). In some species these threads can attain a length of 

 500 /a 1 and more, whilst the links of the chains measure only 



FIG. 17. Bacterium Pasteurianum. The thread form after cultivation for 24 hours 

 on " double beer " at 4040i C. (After HANSEN.) 



2-3 yu. If then this growth of long threads is placed at a 

 temperature of 3 If C. a transformation into the chain form again 

 takes place; while developing at this temperature, the long 

 threads not only increase in length, but also in thickness, and 

 that often very considerably. Thus an endless variety of poly- 



1 1^ = 0-001 millimetre. 



