PLATE 6. 



Micrococcus luteus. Ferd. Cohn, emended by Lehm. 



and Neum. 



I. Gelatin stab, six days at 22°. 



II. Gelatin plate, three days at 22°. X 50. To the 

 left, superficial ; to the right, a deep colony. 



III. Microscopic preparation. X 1000. From a two- 

 days'-old agar plate. Often the micrococci are grouped in 

 tetrads. 



IV. Agar plate, five days at 22°. Natural size. The 

 colonies are sometimes more yellow. 



V. Potato culture, six days at 22°. Sometimes it has 

 a dull luster. 



Sarcina pulmonum. Virchow. Hauser. 

 (Pulmonary Sarcina.) 



VI. Gelatin stab, twenty days at 22°. The stab is in 

 reality more gray. 



VII. Agar streak, twenty days at 22°. 

 VIII. Gelatin plate, twenty days at 22°. To the left, a 

 superficial; to the right, a deep colony. 

 IX. Potato culture, twenty days at 22°. 

 X. Stained flagella. Highly magnified. 



