136 SINGLE-CELLED ANIMALS AS ORGANISMS 



Hunter, Essentials of Biology, Chap. XV. American Book Company. 



Calkins, Protozoology. Lea and Febiger. 



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Davison, Human Body and Health, Advanced, Chap. XXIII. American Book 



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 Ritchie, Primer of Sanitation, Chap. XXVI. World Book Company. 

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