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. 



