FRIEDLANDER GROUP CONTINUED. 



175 



Bacterium aerogenes (ESCH.) Mm. 



SYNONYMS. Bacterium lactis aerogenes ESCHERICH; Bacillus 

 aerogenes KRUSE. 



EXPLANATORY. This organism was first described by Escherich, 

 who isolated it from the milk-stools of infants. It is very similar to 

 Bact. acidi-lactici, and often difficult to differentiate from B. coli. 

 Found in milk, feces, air, water, etc. 



REFERENCES. Escherich, Fortschritte der Medizin, 1885, No. 16- 

 17. C. 128 ; L. & N. 221 ; Mig. 2, 396. 



MORPHOLOGICAL CHARACTERS : 



SKETCHES. 



1. FORM AND ARRANGEMENT: 



a. Bouillon 



6. 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 



4. MOTILITY : 



a. Character of movement.. 

 &. Flagella stain 



5. SPORES : 



6. SPECIAL, CHARACTERS : 



a. Capsules 



&. Involution forms 



c. Deposits or vacuoles 



d. Pleomorphism ,. 



