BACILLUS ANTHRACIS. 



235 



become gradually dissolved. The spore has an egg- 

 shaped form, and is embedded in a spherical transparent 

 mass. When the spores germinate this mass loses at 

 first its spherical form, then the swollen external 

 envelope splits at one pole, and the germinating tube 



A M 



Fig. 63A. Anthrax bacilli (after Koch) X 650. 



A , from the blood of a guinea-pig. 



B, from the spleen of a mouse after being cultivated for three 



hours in aqueous humour. 



taCjc/ / r. 2 r -. 



/? , V, ^ X 



/ 





Fig. 63s. Anthrax bacilli ; spore formation and spore germination. 

 (After Koch.) 



A , from the spleen of a mouse after cultivation for twenty-four hours 

 in aqueous humour. Spores arranged like strings of beads in the 

 threads X 650. 



B, germination of the spores X 650. 



C, the same more highly magnified X 1650. 



shoots out in the direction of the long axis of the spore ; 

 the latter at first remains attached to one end of the 

 young rod. 



The anthrax bacilli are easily cultivated on artificial 

 nutritive substrata, on slices of potato, on gelatine, on 



