Principles of 



U,M 



/ 



ANIMAL ECOLOGY 



By 

 W. C. ALLEE ORLANDO PARK 



Late Professor of Zoology, The University of Chicago Professor of Zoology, Northwestern University 



ALFRED E. EMERSON THOMAS PARK 



Professor of Zoology, The University of Chicago Professor of Zoology, The University of Chicago 



KARL P. SCHMIDT 



Late Chief Curator of Zoology, Chicago Natural History Miisciiin 



W. B. SAUNDERS COMPANY 



PHILADELPHIA AND LONDON 



