EXERCISE 63. ZYMOGENIC CLASS. 109 



Bacterium acidi-lactici Zopf. 



COMMON NAME. Lactic acid bacillus. 



EXPLANATORY. This organism may be taken as a type of the 

 bacteria causing sour milk, of which there are a very large number. 

 It was first described by Hueppe in 1884. It is very widely dis- 

 tributed. 



REFERENCES. Hueppe, Mitteil. aus dem Kaiserl. Gesundheits- 

 amte, 1884, Bd. II. p. 1837 ; C. 149 ; Cn. 189 ; L. 222 ; L. & N. 220. 

 Mig. 2 : 327. 



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.. 



b. Loeffler's methylen-blue. 



c. Gram's stain 



d. Special stains 



i. MOTILITY : 



a. Character of movement.. 



b. Flagella stain 



5. SPORES- 



G. SPECIAL CHARACTERS: 



a. Capsules 



6. Involution forms 



c. Deposits or vacuoles. 



d. Pleomorphism . 



