PLATE IV. 



FIGS. 1, 2, and 3. Leucocytes from the spleen of an inoculated 

 monkey, containing Spirillum Obermeieri. (Soudakewitch.) 



FIGS. 4 and 5. Leucocytes (" niacrophages ") from a preparation of 

 muscle from a pigeon which succumbed to an anthrax inoculation. In 

 Fig. 4 the bacilli are deeply stained; in Fig. 5 they are pale. (Metsch- 

 nikoff.) 



FIG. 6. Leucocyte from a frog seventy-two hours after the injection 

 of anthrax spores. (Trapeznikoff . ) 



FIGS. 7 and 8. Leucocytes from a chicken four hours after the in- 

 jection of anthrax spores. (Trapeznikoff.) 



