LIST OF ILLUSTRATIONS. 



FiCiUKE 1. Ilemorrhagif inguinal bubo. (FigH. 1 to 5 are drawn from nature 

 .from post-mortem specimens preserved in Kaiserling'n fluid. 

 All except fig. 3, which is reduced one-half, are natural size. ) 



2. Heart in a case of bubonic plague, showing subepicardial hemor- 



rhages. 



3. Stomach in a case of l)ubonic plague, showing submucous hemor- 



rhages. 

 4, 5. Kidney in a case of bubonic plague, showing subcapsular and pel- 

 vic hemorrhages. 



6. Culture of plague bacillus on agar, five daj's' growth, fixed with 



formalin vapors. 



7. Colony of a plague gelatin plate culture, forty-eight hours old 



(Zeiss A A ocular No. 3), showing the dark, elevated center and 

 the homogeneous marginal zone. 



8. Cover-glass preparation from a twenty-four-hour-old agar plague 



culture; stained with dilute carbol-fuchsin. 



9. Same, showing typically stained bacilli and also uniformly stained 



involution forms. 



10. Same, from a sixteen-day-old glycerin-agar culture; club-shaped 



involution forms. 



11. Same as fig. 10, spermatozoa-like involution forms. 



12. Same, from a three-day-old 4 per cent salt-agar culture; yeast-shaped 



involution forms. 



13. Pof-t-mortem smear from a plague bubo. 



14. Post-mortem smear from the spleen in a case of bubonic plague. 

 15, 16. Post-mortem smears from a case of plague pneumonia. (Necropsy 



No. 971.) 



17. Post-mortem smear from the heart's blood in necropsy No. 973, 



showing one plague bacillus in the center of the field. (X 

 2,000. ) 



18. Section of inguinal lymph gland from necropsy No. 901, showing 



dilated blood vessels. 



19. Section of submental gland, necropsy No. 928. Near the center 



of the field may be seen a plasma mast cell surrounded by dense 

 zo(")gleal masses of plague bacilli. 

 20-23. Sections of the kidney; hyaline fibrin thrombosis of the glome- 

 rular vessels. 



24. Section of lung from necropsy No. 901; tubercle witli giant cell. 



This tubercle showed an infection with plague bacilli. 



25. Section from the liver in necropsy No. 901. Infiammatory focus 



with many eosinophilic leucocytes. 

 2(5. Pulex philippinensis, species nova — the flea found on rats in 



Manila; male. 

 27. The same, female. 



