BACTERIA 



35 



nitrogenous and it is covered by a layer of mucilage which 

 makes it possible for bacteria to form chains and colonies. 

 In both forms the wall encloses a slightly granular, trans- 



*vx, 





FIG. 8. Long slender bacilli. X 

 1000 diameters. (After Park.) 



FIG. 9. Very large spirilla. (After 

 Park.) 



parent protoplasm containing one or more non-contractile 

 vacuoles and one or more rounded grains that react to nuclear 



tm 



FIG. 10 FIG. 11 FIG. 12 



FIGS. 10, 11 and 12. Fig. 10, Spirillum undula; Fig. 11, Bacillus solmsii; 

 Fig. 12, Vibrio cholerse. The flagella are well shown. (After A. Fischer.) 



stains. These grains probably represent an elemental 

 nucleus. In some forms hair-like outgrowths from the wall 

 (cilia) occur; they make locomotion possible. 



