

3 



PLANT ECOLOGY 



BY 



W. B. McDOUGALL 



REGIONAL BIOLOGIST, SECTION ON NATIONAL PARK WILDLIFE, FISH AND WILDLIFE 



SERVICE, SANTA FE, NEW MEXICO 



THIRD EDITION, THOROUGHLY REVISED 



ILLUSTRATED WITH 119 ENGRAVINGS 



LEA & FEBIGER 



PHILADELPHIA 

 1941 



