136 SINGLE-CELLED ANIMALS AS ORGANISMS 



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



Calkins, Protozoology. Lea and Febiger. 



Calkins, The Protozoa. The Macmillan Company. 



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



Company. 

 Guyer, Animal Micrology. University of Chicago Press. 

 Jennings, Study of the Lower Organisms. Carnegie Institution Report. 

 Jordan, Kellogg, and Heath, Animal Studies. D. Appleton and Company. 

 Macfadyen, The Cell as the Unit of Life. P. Blakiston's Son and Company. 

 Parker, Lessons in Elementary Biology. The Macmillan Company. 

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

 Shannon, The Microscopic Animals of the Sea. Harper's Magazine, June, 1910. 

 Sharpe, Laboratory Manual in Biology, pp. 140-143. American Book Company. 

 Wilson, The Cell in Development and Inheritance. The Macmillan Company. 



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