.' 



PLATE IV. 



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



Alcoholic eosin 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 spirochsete of relapsing fever. 



Irishman's stain. x 1000 diameters. 



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



flagella. x 1000 diameters. 



FIG. 20. Bacillus tetani, showing spores. 



x 1000 diameters. 



'* I 



o \ 



-"--** 





?'^'~v7 



o/'J, 



v 



FIG. 20. 



