74 BACTERIOLOGY 



4. M. Demmei 



Diplococcus ef pemphigus acuta Demme : Verhandl. des Vet. Congress fur innere Med. in 



Wiesbaden, 1886. 



Morphology. Cocci 0.8-1 .4 /*, usually in pairs like gonococcus. No capsule ; 

 usually in irregular masses. 



Aerobic. Minimum temperature ± 32° C. 



Agar colonies. In 36-48 hours at 37° C, round, raised, milk-white, becoming 

 rosette-like forms, with outgrowths, or moruloid ; creamy white. 



Agar slant. Growth creamy white, with clavate and stalactite elevations. 



Potato. At 37° C. a slow growth. 



Pathogenesis. Injections into lungs of guinea pigs cause emaciation and de- 

 bility, with foci of bronchopneumonia. 



Habitat. Isolated from contents of bullae in a case of pemphigus. 



5. M. endocarditis Weichselbaum 



M. endocarditis rugatus Weichselbaum : Ziegler's Beitrage, IV, 1889, 127. 

 Morphology. Similar to M. pyogenes. Aerobic. 

 Agar Colonies. Deep colonies : irregular, granular ; a large central, yellowish 



brown nucleus, surrounded by a narrow grayish brown periphery. Surface 



colonies: a small brown central nucleus, with a translucent granular, 



grayish brown periphery, becoming wrinkled, with a stearine lustre, and 



viscid. 

 Potato. At 37" C. a feeble growth, as small, dry, pale brownish masses. 

 Blood serum. Discrete, confluent, colorless colonies. 

 Pathogenesis. Rabbits inoculated subcutaneously in ear show a tumification 



and oedema. With guinea pigs, a local suppuration. Dogs, inoculated 



intravenously, endocarditis. 

 Habitat. Isolated from affected cardiac valves in fatal cases of ulcerative 



endocarditis. 



CLASS III. WITHOUT PIGMENT. GROW ON ORDINARY CULTURE 

 MEDIA AND AT ROOM TEMPERATURES, 20° C. GELATIN 

 LIQUEFIED. 

 I. Liquefaction of the gelatin proceeds more or less rapidly. 

 A. Grow on potato. 



I. Growth on potato white. 



a. Liquefaction of the gelatin takes place along the entire length 

 of the stab ; i.e. infundibuliform — cylindrical. 



Micrococcus Pyogenes Group. 



