UNIT AND DIVISION OF LABOR 143 



10. What is said to be the cause of malaria ? 



11. What are trypanosomes ? 



12. Tell of the use of Protozoa as food. 



13. Tell of Protozoa and rock building. What is chalk ? 



14. Explain the statement, " The cell is a unit." 



15. How do Protozoa respond to stimuli ? 



16. Distinguish between Protozoa and Metazoa. 



17. Why are Protozoa of great importance to the world ? 



18. What is tripoli ? 



19. What are parasitic Protozoa ? 



20. What is a hay infusion ? 



21. Explain: "The basis of all the life in the modern ocean 

 is found in the microorganisms of the surface." 



Special Reports 



1. The formation of chalk. 



2. Protozoa and malaria. 



3. The tsetse fly and sleeping sickness. 



4. Barbados earth. Infusorial earth. 



6. The relation of Protozoa to higher forms of life. 

 6. The importance of Protozoa to man. 



References 



Hunter, Essentials of Biology. Chap. XVI. 

 Hunter, Elements of Biology. Chap. XII. 

 Ritchie, Primer of Sanitation. Chap. XXVI. 



Davison, The Human Body and Health (Advanced). Chap. XXIII. 

 Weeks, "The Practical Side of Mosquito Extermination." Science, 

 Vol. XXIII, p. 379, 1906. 



Macfayden, The Cell as the Unit of Life. 

 Calkins, G. N., Proto-zoology. 



PROBLEM XXVI 



An introductory study of -many-celled animals (Meta- 



zoa). 



Method. Develop the idea of the many-celled gastrula 

 from the fertilized egg by using models, diagrams, etc. 



