EXERCISE 88. COLON GROUP. 219 



Bacillus coli (Esohemch) Mig. 

 Synonyms. Bacterium coli commune Esch. ; Colon bacillus. 



Explanatory. Eseherieh was the first to describe this organism 

 which is widely known as a common inhabitant of the colon of man, 

 and of some of the lower animals. 



References. Eseherieh, Darmbakt. des Sauglinc:s, Stuttgart, 

 1886 ; A. 432 ; C. 205 ; H. 282 ; K. & W. II, 334 ; L. & N. 243 ; Mig. 2, 

 734 ; M. & R. 325 ; McP. 510. 



MORPkOLOGICAL CHARACTERS: 



Sketches. 



1. Form and aeranoement: 

 a. Bouillon 



b. Agar . 



-. Gelatin. 



d. Other media.. 



Size: 



Staining powers ; 



u. Aqueous gentian-violet. . 



6. Loeffler's methylen-blue. 



V. Gram's stain 



d. Special stains 



Motility : 



u. Cliaraoter of movement... 



b. Flagella stain 



5. Spokes: 



Special characters: — 



a. Capsules 



6. Involution forms 



c. Deposits or vacuoles. . 



d. Pleomorphism 



