±KIEDLANDEE GROUP— Continued. 175 



Bacterium aerogenes (Bsch.) Mig. 



Synonyms. Bacterium lactis aerogenes Escherich; Bacillus 

 aerogenes Keuse. 



Explanatory. This organism was first described by Escherich, 

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

 Baet. aeidi-lactici, and often difficult to differentiate from B. eoli. 

 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 : 



1. Form and arrangement: 

 u. Bouillon 



Sketches. 



6. Agar . 



u. Gelatin- 



d. Other media. . 



2. Size: 



3. Staining powers : 



u. Aqueous gentian-violet. . 

 6. LoefBer's metliylen-blue. 



V. Gram's stain 



(1. Special stains 



4. Motility : 



u. Character of movement. . - 

 6. Flagella stain 



5. Spores : 



'6. Special OHARAOTEEs: — 



a. Capsules 



6. Involution forms 



c. Deposits or vacuoles.. 



d. Pleomorphiam 



