SOME COMMON BACTERIA SLIGHTLY PATHOGENIC IOI 



long threads. Flagella are found on the ends. Spores of 

 oval shape, strongly shining, very resistant. 



Very motile; Gram stain. . 



Growth. Rapid; strongly aerobic. 



Plate. Round, gray colonies with depressed white center. 

 Under microscope the center yellow; the periphery like a 

 wreath, with tiny little rays projecting; very characteristic. 



A gar Stroke. Soft, round, smooth edges; gray. 



Gelatin Stab. Gray on surface, sinks in thirty-six hours, 

 shallow crater, in which small white particles are floating; 

 as gelatin softens a skin forms on surface. 



Potato. Thick, dirty-white grow r th, spreading over sur- 

 face; dull, raised edges, wavy. 



Properties like B. vulgatus. 



Pathogenic. Has been found present in eyeball suppura- 

 tions, especially panophthalmitis. Injected in guinea-pigs it 

 causes toxemia and death. Has been found in acute conjunc- 

 tivitis, and may at times produce it. 



Staining. Rods, ordinary stain; spores, spore stain. 



It is easily obtained by covering finely cut hay with dis- 

 tilled water, and boiling a quarter of an hour. Set aside 

 forty-eight hours. A thick scum will show itself on the sur- 

 face, composed of the subtilis bacilli, whose spores alone have 

 survived the heat. 



Was formerly considered a non- virulent form of B. anthrax. 



Boas-Oppler Bacillus. Also known as the Bacillus 

 geniculatus. Owing to the faculty possessed by this organ- 

 ism of growing in the presence of amounts of lactic acid suf- 

 ficient to check the development of all other lactic-acid form- 

 ers, it usually predominates in stomach-contents containing 

 large amounts of this substance. The parent type is com- 

 posed of short rods, but in the presence of considerable 

 amounts of lactic acid these change to a longer form, which 

 occurs singly or in long chains. It is stained brown by Gram's 

 iodin solution. The bacillus affords confirmatory evidence 

 of the presence of a new-growth, like cancer of the stomach, 

 though it may occur in benign conditions. 



