I 68 BACTERIA 



bility of the splenic pulp, and all the glands of the body become 

 enlarged, and, at times, many of them suppurate. In wool-sorter's 

 disease, the bacilli are inhaled, and lung lesions result. 



Immunity. It is possible to immunize animals against infection 

 with anthrax by means of vaccines. By this means the lives of 

 many thousands of domestic animals have been saved. The vac- 

 cines are made by growing the bacillus at 42 C. for various lengths 

 of time to attenuate them. It is possible but impracticable to 

 produce an anthrax anti-toxin. 



TETANUS BACILLUS. 



Bacillus Tetani. 



Tetanus Bacillus. (Fig. 57.) 

 Lockjaw Bacillus. 

 First seen by Nicolaier, and isolated in pure culture by Kitasato. 



FIG. 57. Tetanus bacilli showing end spores. (Kolle and Wassermann.) 



Morphology and Stains. Rod-shaped. Varying from 1.2 p in 

 length, to very long threads of 20 to 40/1. Sometimes grow in 

 chains; frequently appear like short drum-sticks with a spore at one 



