1G PROTOZOOLOGY 



vated Balantidium coli and Boeck (1921) cultivated Chilomastix 

 mesnili. Boeck and Drbohlav (1925) succeeded in cultivating Enta- 

 moeba histolytica, and their work was repeated and improved upon 

 by many investigators. While the in-vitro cultivation has not thrown 

 much light on metabolic activities of this and other parasitic 

 amoebae, as no one of them would grow in culture without some 

 other organisms, it has increased our knowledge on the biology of 

 these parasites. 



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