THE STRUCTURE OF BACTERIA. 25 



1. 2. 



B. termo ; 3, Cholera bacteria. 4, Typhoid 

 bacteria showing rolling up of flagella (a) 



Fig. 12. Flagella. 



I, B. subtilis ; 2, 



free flagella,' partly 



(b) and wholly (c) coiled. " 1-4 enlarged about 1500 diameters 

 (after A. Fischer). 5, 6, Proteus vulgans after micro-photographs 

 by Fraenkel and Pfeiffer ; 1500 diameters. 7, Swine plague 

 bacillus. 8, Potato bacillus. 9, Spirillum scrpcns after micro- 

 photograph by Neuhauss (i : 1000). 



