"■'^'fe, 



THE NEW YORK BOTANICAL GARDtN 

 XTbe 'Clntversiti? of CbicaQO 





^ 



^A 



THE ECOLOGICAL SIGNIFICANCE OF THE 



EAGLE CREEK FLORA OF THE 



COLUMBIA RIVER GORGE 



A DISSERTATION 



SUBMITTED TO THE FACULTY 



or THE OGDEN GRADUATE SCHOOL OF SCIENCE 



IN CANDIDACY FOR THE DEGREE OF 



DOCTOR OF PHILOSOPHY 



DEPARTMENT OF GEOLOGY 



P^Xl^'i^ 



BY 



RALPH WORKS CHANEY 



Private Edition, Distributed By 



THE UNIVERSITY OF CHICAGO LIBRARIES 



CHICAGO, ILLINOIS 



Reprinted from 



The Journal of Geology, VoL XXVI, No. 7 



October-November 19 18 



