GLANDERS. 



199 



The glanders bacillus is somewhat shorter and dis- 

 tinctly thicker than the tubercle bacillus. It has rounded 

 ends, and it generally occurs singly, though upon blood- 



. - 



FIG. 59. Bacillus mallei, from a culture upon glycerin agar-agar; x 1000 

 (Frankel and Pfeiffer). 



serum, and especially upon potato, several joined indi- 

 viduals may be found. Long threads are never formed. 



The bacillus is non-motile. Various observers have 

 claimed the discovery of spores, but although in the 

 interior of the bacilli there have been observed irregular 

 spaces like the similar spaces in the continuity of the 

 tubercle bacillus not colored by the stains, they have 

 not yet been definitely proven to be spores. The ob- 

 servation of lyoffler that the bacilli can be cultivated 

 after being kept in a dry state for three months makes it 

 appear as if some permanent form (spore) occurs. No 

 flagella have been demonstrated iipon the bacillus. 



Like the tubercle bacillus, the glanders bacillus does 

 not seem to find conditions outside the animal body suit- 

 able for its existence, and probably does not occur except 

 as a parasite. 



The organism only grows between 25 and 42 C., and 

 generally grows very slowly, so that attempts at its isola- 



