242. 



THE QUARTERLY REVIEW OF BIOLOGY 



the protozoan parasites of monkeys and 

 man belong for the most part to the same 

 species or are so similar in their structure, 

 life-cycles, and host-parasite relations as to 

 be practically indistinguishable. This 

 situation is particularly striking when the 

 protozoa of monkeys are compared with 

 those of other animals associated with 



man. If the proposition that close 

 relationships of parasites indicate a com- 

 mon ancestry of their hosts is valid, 

 then the facts available regarding the 

 protozoan parasites of monkeys and man 

 furnish evidence of importance in favor 

 of the hypothesis that monkeys and man 

 are of common descent. 



LIST OF LITERATURE 



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Brumpt, E. and Joyeux, Ch. 1911. Sur un in- 

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