LIST OF ILLUSTRATIONS 



Anti-Mosquito Measures. British Guiana, i. Old' 



Canal -a Breeding - Place for Mosquitoes. \ Frontispiece 

 2. Canal filled in and converted into an Avenue. 

 (Photos by Dr. D. Thomson) 



FIG. PAGE 



1. Amoeba proteus . - - 2 



2. A Flagellate Prowazekia 14 



3. Vorticella, an Example of a Ciliate, attached to a Piece of 



Wood 17 



4. Trypanosoma gambiense, from Blood 21 



5. Diagrammatic Representation of the Formation of Non- 



Flagellate (Latent) Bodies of Trypanosoma gambiense in 



Infected Rat's Blood - 26 



6. Diagrammatic Representation of the Metamorphosis of a 



Latent or Non-Flagellate Parasite into a Flagellate 



Trypanosome (T. gambiense) 27 



7. Trypanosoma rhodesiense 37 



8. Trypanosoma (Schizotrypanum) cruzi 41 



9. Crithidia pulicis : Stages leading to the Flagellate Form - 49 



10. Crithidia pulicis : Flagellates 51 



11. Crithidia pulicis: Four Stages in the Formation of Post- 



Flagellate Forms 52 



12. Herpetomonas pediculi : Pre- Flagellate to Flagellate Stages 55 



13. Herpetomonas pediculi : Flagellate Stage 56 



14. Herpetomonas pediculi : Division Forms 57 



15. Herpetomonas pediculi : Post-Flagellate Stages 58 



16. Trypanoplasmadendrocceli, from Dendroccelum lacteum : Flagel- 



late Form 60 



ix 



