



PLATE IV. 



FIG. 16. Negri bodies in nerve cells in rabies (hippocampus of dog). 

 Alcoholic eoein and methylene-blue. x 1000 diameters. 



FIG. 17. Bacillus pestis, showing involution forms, from a salt-agar 

 culture. x 1000 diameters. 



FIG. 18. Blood film, showing the spirochaete of relapsing fever. 

 Irishman's stain. x 1000 diameters. 



FIG. 19. The cholera spirillum, from a 12-hours' agar culture, showing 

 flagella. x 1000 diameters. 



FIG. 20. Bacillus tetani, showing spores. x 1000 diameters. 





Km. 19. 



20 



