EXERCISE 94. EMPHYSEMA GROUP. 273 



Bacterium Welchii MIG. 



SYNONYMS. Bacillus aerogenes capsulaius WELCH; B. der Gasphlegmon 

 FRAENKEL; B. emphyseraatasus KRUSE. 



EXPLANATORY. First described by Welch in 1892. Occurs at autopsies in. 

 which gas bubbles are present in the larger vessels, accompanied by the for- 

 mation of numerous small cavities in the liver containing gas. It has been 

 found also in emphysematous phlegmons, in puerperal sepsis, in peritonitis 

 and in other conditions (M. & W.). Widely distributed in nature. (Welch.) 



REFERENCES. Welch and Nuttall, Bull. Johns Hopkins Hospital, 1892, 3, 

 81; Welch and Flexner, Jour. Exp. Med., 1896, 1, 5; C. 183; H. 329; L. & N. 

 344; Mig. 392; M. & R. 402; McF. 591; P. 545. 



MORPHOLOGICAL CHARACTERS: j SKETCHES. 



1. FORM AND ARRANGEMENT: 



. Bouillon : 



b. Agrar 



c. Gelatin 



L Other media. 



SIZE: 



STAINING POWERS : 



a. Aqueous gentian-violet.. 



b. Loeffler's methylen-blue. 



\ 

 c. Gram's stain 



d. Special stains 



4. MOTILIT Y : 



a. Character of movement. 



b. Flagella stain 



5. SPORES:... 



SPECIAL CHARACTERS:.... 



a. Capsules 



b. Involution forms 



o. Deposits or vacuoles. 

 d. Pleomorphism 



