PLATE 4. 



Sarcina aurantiaca. Flugge. 



I. Gelatin stab culture, six days at 22°. 

 II. Agar streak culture, five days at 22°. The color is 

 not so red in all cases; usually light orange. This is also 

 true of the agar stab and potato cultures. 



III. Agar stab culture, six days at 22°. Stab canal. 



IV. Agar stab culture, six days at 22°. Surface 

 growth. 



V. Gelatin plate, five days at 22°. Natural size. The 

 gray zone about the colonies indicates a depression. 



VI. Gelatin plate, five days at 22°. X 60. A colony 

 in the early stage. The gray ring represents a zone where 

 it is sinking in. 



VII. Agar plate, five days at 22°. Natural size. 

 VIII. Agar plate, five days at 22°. X 60. Upper 

 colony, superficial; lower colonies, deep. The superficial 

 colonies usually become opaque toward the center. 

 IX. Potato culture, eight days old. 

 X. Microscopic preparation. Pure culture from agar. 

 X 1000. Stained with fuchsin, differentiated with acetic 

 acid. 



XI. Microscopic preparation. Pure culture in bouillon. 

 X 1000. Unstained, partly schematic. 



