PLATE 7. 

 Micrococcus tetragenus. Koch. Graff ky. 



I. Agar streak culture, five days at 37. 

 II. Gelatin stab culture, ten days at 22. Stab canal. 

 Characteristic nail-head form. 



III. Gelatin stab culture, ten days at 22 ; surface growth. 

 In the reproduction the color has turned out brown, but 

 should be white. 



IV. Agar stab culture, six days at 37. Surface growth. 

 V. Agar stab culture, six days at 37. The growth 



along the stab is not always so luxuriant. 



VI. Agar plate, five days at 37. Natural size. 

 VII. Gelatin plate, eight days at 22. The colonies are 

 naturally pure white. Natural size. 



VIII. Gelatin plate, eight days at 22. X 60. The 

 larger colony is superficial ; the smaller, deep. 



IX. Microscopic preparation. From a two-days'-old 

 agar culture. X 800. There are not always found 

 tetrads alone, often also single cocci. 



X. Potato culture, seven days at 37. 

 XI. Microscopic picture. Tetrads before, during, and 

 after division; highly magnified. 



XI. 



