272 MICRO-ORGAMSMS AND DISEASE [chap. 



with free access of air, bright b^'al spores make their appear- 

 ance, while the filaments become homogeneous and swollen. 

 These spores become free, and when artificially cultivated or 

 injected into a rodent animal germinate into the character- 

 istic bacilli ; these elongate and divide, and in artificial 



FiG. loi.— Film Si'Ecime:j of Rlood of Guinea-pig dead of Malignan 

 Anthrax-, showing Elood Discs and Bacilli's Anthracis in Chains. 



X about 700. 



cultures again grow into the long leptothrix filaments, which 

 again form spores. Koch ^ saw in preparations of aqueous 

 humour kept at 35° C. in the incubator the spores germin- 

 ating after three to four hours. The single bacilli as they 

 present themselves in the blood measure between 0-005 ^"d 



1 Bc-i/r :. Biol. d. Pflanzen, vol. ii. pari ii. p. 2SS. 



