18 



THE ORGANISM IS A MICEOCOCCUS. 



THE GELATINE IS NOT LIQUEFIED. 



THE COLONIES AEE WHITE, NOT CONFLUENT, 

 AND GBOWING SLOWLY. 



THE COCCI ARE IN MASSES. 



Micrococcus candicans (Flftgge), from air and water; spherical cocci, 



1 /u in diameter. . 



Micrococcus aq.uatilis, from water ; small cocci in irregular groups. 

 Staphylococcus cerfeus alhus (Passet), from pus; large sohtary cocci, 



1'16 ft in diamfeter ; the colonies resemble drops of'stearin. 

 Micrococcus concentricus (Zimmerman), from water ; cocci 0'9 m in 



diameter ; the colonies first appear as bluish-gray points. 

 Micrococcus acidi lactici, from cow's milk ; large solitary cocci ; the 



colonies have a yellowish tinge. 

 Micrococcus cumulatus tenuis (von Besser), from nasal mucus ; 



large oval cocci in masses ; the colonies on agar appear as thick 



transparent drops, with a brown nucleus and wrinkled margin. 

 Micrococcus gingiva pyogenes (Miller), from an alveolar abscess; 



large, irregular cocci, solitary or in pairs ; colonies have a purple 



tint by transmitted hght. 

 Micrococcus rosettaceus, from water '; spherical cocci ; the colonies 



have a yellowish tinge. 

 Micrococcus salivarius septicus (Eiondi), from the saliva in a case 



of puerperal septiossmia, by inoculation through a guinea-pig; 



oval cocci, which, when multiplying rapidly, show sUght lateral 



protrusions ; stains well by Gram. 



