BACILLUS TETANL 379 



flagella attached both at the sides and at the ends (Fig. 

 96). These flagella, though they may be of considerable 

 length, are usually curled up close to the body of the 

 bacillus. The formation of flagella can be best studied 

 in preparations made from surface anaerobic cultures (p. 

 74). As is the case with many other anaerobic flagellated 



FIG. 96. Tetanus bacilli, showing flagella. 

 Stained by Rd. Muir's method. x 1000. 



bacteria the flagella, on becoming detached, often become 

 massed together in the form of spirals of striking ap- 

 pearance (Fig. 97). At incubation temperature B. tetani 

 readily forms spores, and then presents a very characteristic 

 appearance. The spores are round, and in diameter may 

 be three or four times the thickness of the bacilli. They 

 are developed at one end of a bacillus, which thus assumes 



