QUESTIONS. 195 



dysenteric stools, and the pus in cases of suspected amoebic 

 infection, should be made in fresh specimens, when the live 

 amoebae may be easily recognized. Dried preparations are 

 made as for bacterial examination, and colored with aqueous 

 solution of methylene-blue. 



QUESTIONS. 

 Streptothrix. 



What is a Streptothrix ? How does it resemble moulds ? How does it dif- 

 fer from moulds? How does it resemble bacteria? 



Which are the best known of the streptothrices ? 



Why are the Bacillus tuberculosis and Bacillus diphtherix believed to belong 

 to the class of the streptothrices ? 



What is the appearance of the lesion caused by streptothrices ? 



Describe the Streptothrix actinomyces,nT ray fungus. How is it best stained? 



Give Mallory's staining method. 



Give the principal biologic characters of the Streptothrix actinomyces. 

 How does it grow on blood-serum and agar ? On gelatin ? On potato ? In 

 bouillon ? 



What animals are susceptible to Streptothrix infection ? Is the disease 

 transmissible from animal to animal or from animal to man ? How are ani- 

 mals infected ? 



Describe the lesions produced by Streptothrix infection. What causes the 

 suppuration ? 



What other pathogenic streptothrices have been described and studied ? 



Malaria. 



What is the Plasmodium malarise f 



How many life-cycles has it? Where are those phases of life completed? 



Describe the life-cycle of the plasmodium in man. 



What are the two principal symptoms of malaria, and what relation have 

 thev to the development of the parasite? 



What differentiates the varieties of the malarial parasites from each other ? 



What three varieties are at present recognized? 



What forms of fever are caused by these different varieties? 



What life-cycle only begins in the body of man? 



Describe the flagellated and non-flagellated bodies? 



What are the crescent bodies? 



How do those crescent bodies or their homologues develop in the body of 

 the mosquito? 



What are the microgametocytes? 



What are the macrogametes ? 



Describe the development of the fecundated macrogametes in the mos- 

 quito ? 



What are the sporozoites, and how do they infect man ? 



What is the duration of the life-cycle parasite in the mosquito? 



Does the mosquito transmit the malarial parasite to its larva? 



