1 84 



BACTERIA 



spores and grow in long threads, these threads form long spirally 

 twisted masses, like locks of wavy hair. No flagella are formed, 

 and the organism is not motile. In old cultures, bizarre involu- 

 tion forms are found. It stains well with 

 all the common basic dyes and by Gram's 

 method. 



Oxygen Requirements. Is a facultative 

 anaerobe, but grows much better in the 

 presence of oxygen. If oxygen is excluded, 

 no liquefaction occurs. 



Temperature. Grows between i4C. and 

 45C.; best at 37C. Spores are formed, if 

 oxygen is present, between i5C. and 4oC. 

 Sporulation is more rapid at 37C. Spores 

 withstand high temperature (dry) for a long time, iooC. for one 

 hour. The bacillus itself is killed at 7oC., moist heat, in one 



. FIG. 51. Anth- 

 rax bacilli in blood. 

 (Greene's Medical 

 Diagnosis.) 



FIG. 52. Anthrax bacilli growing in a chain and exhibiting spores, 

 and Wassermann.) 



(Kolle 



minute. The thermal death-point may be put down for the 

 organism, at iooC. steam, for five minutes. 



