88 



BACTERIA 



loosely attached, forming chains. These are very common 

 in some species of micrococcus (see Fig. 15). 



Bacillus when undergoing fission behaves something like 

 Heteromita : the mother-cell divides transversely across the 

 middle, and the two halves gradually wriggle away from one 

 another, but remain connected for a time by a very fine thread 



FIG. 17. A, Vibrio. 

 (From Klein.) 



B, Spirilhtm tenue. c, S-birihum voiutans. 



of protoplasm which extends between their adjacent ends. 

 This is drawn out by the gradual separation of the two cells 

 until it attains twice the length of a flagellum when it snaps 

 in the middle, thus providing each daughter-cell with a ne\v 

 flagellum. Bacillus may, however, divide while in the 

 resting condition and, under certain circumstances, the 

 process is repeated again and again, and the daughter-cells 



