l62 ELEMENTARY ZOOLOGY. 



1 80. Topics for themes in Zoology or English. 



1. The economic importance of Protozoa. 



2. The diseases in man caused by sporozoa. The r61e 

 of the mosquito in the life history of the sporozoa causing 

 malaria and yellow fever. The bearing of these facts 

 upon the management necessary to prevent the spread 

 of these diseases. 



3 . Of what substance is chalk. How is it produced? 



4. Why should Volvox and Euglena be considered 

 animals rather than plants? 



5. Conjugation in Paramecium: its method and its 

 results. What part do the nuclei play in the process? 



6. Conjugation in Vorticella. How does it differ from 

 that of Paramecium? 



7. Variations in Protozoa as to the size, shape, and 

 structure of the cell. 



