PLATE 4. 

 Sarcina aurantiaca. Fliigge. 



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. 



