EXERCISE 60. C1IROMOGKENIC CLASS. 1Q3 



Bacillus prodigiosus (Ehrenb.) Fluegge. 



SYNONYMS. Monas prodigiosa Ehrenb.; M. prodigiosus Cohn. 



EXPLANATORY. This organism was first described by Ehrenberg. It is 

 the oldest known chromogenic bacterium. It is very commonly found in the 

 air of Europe and has a very interesting history on account of its casual 

 relation to bread epidemics ''bloody bread," "bleeding host," etc. It 

 occurs spontaneously in this country. It is slightly pathogenic. Introduced 

 intraperitoneally into guinea pigs in large quantities it produces death. In- 

 oculated into animals naturally immune to malignant oedema it renders them 

 susceptible. Rabbits inoculated with anthrax are protected by a subsequent 

 inoculation with this organism. It is grown with the streptococcus of erysip- 

 elas to produce Coley's Fluid for treatment of inoperable malignant tumors. 



REFERENCES. Ehrenberg, Verhandlunger der Berliner Akademie, 1839; C. 

 258; L. 137; L. & N. 272; Mig. 2: 845. 



MORPHOLOGICAL CHARACTERS : 



SKETCHES. 



1. FORM AND ARRANGEMENT: 

 a. Bouillon 



b. Agar. 



c. Gelatin. 



d. Other media. , 



2. SIZE: 



3'. STAINING POWERS : 



a Aqueous gentian- violet.. 



&. Loeffler's methylen-blue. 



c. Gram's stain 



d. Special stains 



4. MOTILITY : 



a. Character of movement. . 

 6. Flagella stain 



5. SPORES:. 



SPECIAL CHARACTERS : 



a. Capsules 



6. Involution forms 



c. Deposits or vacuoles.. 

 *?. Pleomorphism . . 



