PLATE 64. 

 Mycobacterium lacticola a planum. L. and N. 



I. Streak culture (ordinary agar), two months at 22°. 

 II. Streak culture (glycerin-agar), six days at 37°. 



III. Streak culture (glycerin-agar) , three months at 22°. 

 The culture at first is whitish; later, it becomes very in- 

 tensely orange-red. 



IV. Streak culture (gelatin), six days at 22°. 



V. Potato culture, six days at 22°. Its appearance 

 varies widely. Sometimes it is lighter, sometimes darker, 

 sometimes moister, sometimes drier, sometimes smooth, 

 sometimes wrinkled. 



VI. Plate culture (gelatin), six days at 22°. X 60. (a) 

 Superficial colony, resembling the colon ; (6) deep colony. 



VII. Plate culture (gelatin), six days at 22°. Natural 

 size. 



VIII. Plate culture (glycerin-agar), three days at 37°. 

 X 60. Superficial colony. 



IX. Plate culture (glycerin-agar), three days at 37°. 

 Natural size. 



X. Microscopic preparation. Glycerin-agar, three 

 days. X 1000. Stained with fuchsin. The size, of the 

 rods scarcely varies in very old cultures. There as here are 

 found small and large, slender and thick rods. 



