PLATE XL 



Bacillus tuberculosis. 



FIG. i. 



Pure cultivation of the tubercle-bacillus on blood-serum 

 solidified obliquely. 



FIG. 2. 



Pure cultivation on solid blood-serum in a glass cap- 

 sule. 



FIG. 3. 



The same as Fig. 2, examined under a low power of 

 the microscope. x 80. 



FIG. 4. 



Impression-preparation showing the peculiar serpentine 



growth of the colonies on blood-serum. x 700. 

 (After Koch, Mittheil. a. d. Kaiser I. Gesundh. 



