EXERCISE 94. EMPHYSEMA GROUP. 273 



Bacterium Welchii Mig. 



Synonyms. Bacillus aerogenes capsulatus Welch; B. der Gasphlegmon 

 Fraenkel; B. emphysematasus 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.) 



Eefeuences. 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. & E. 402; McP. 591; P. 545. 



Morphological chakacters : 



1. Form and arkangement: 

 a. Bouillon 



Sketches. 



5. Agar . 



c. Gelatin 



d. Other media.. 



Size: 



Staining powers : 



a. Aqueous grentian- violet. . 



b Loeffier's methylen-blue. 



c. Gram's stain 



d. Special stains 



Motility: 



c(. Character of movement... 

 6. Plagella stain 



5. Spores: 



Special characters:.- .. 



II. Capsules 



b. Involution forms 



t. Deposits or vacuoles.. 

 d. Pleomorphism 



