Fig. 73. — B. Diphtheria. 



Cover Glass Preparation, Serum Culture, 72 hours' growth 

 (37 C), Roux's Stain, j 1 .,- apochromat, Projection ocular 6. 

 x 1000. 



Fig. 74. — B. Diphtheria. 



Cover Glass Preparation, Gelatine Culture, 72 hours' growth 

 at 21 C, Roux's Stain, ^ apochromat, Projection ocular 6. 



