PROTOZOA 163 



waters of the earth, increasing or decreasing as their food 

 varies in abundance. 



203. Supplementary Studies for the Library. 



1. The reactions of Protozoa to light; to chemical substances; to heat; etc. 



2. Their power of resistance to heat; cold; drouth. The practical results 

 thereof. 



3. The economic importance of Protozoa. 



4. What is "plankton"? What is the importance of its study? 



5. Conjugation in Protozoa. Compare methods of reproduction and conjuga- 

 tion in the various groups. Follow the nuclear changes in conjugation of Para- 

 mecium. 



6. Why should Volvox and Euglena be considered animals rather than plants? 



7. Diseases in man or animals believed to be caused by the Sporozoa. The r61e 

 of the mosquito in the life history of the sporozoa causing malaria and yellow fever. 

 The life cycle of this parasite. The bearing of these facts upon infection and the 

 management of these diseases. 



8 Forms of the Protozoa of different classes as shown by the illustrations in the 

 larger text-books. 



9. The varying form of the nucleus in different species of Protozoa. 



