PRINCIPLES OF BOTANY 



BY 



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JOSEPH Y. BERGEN, A.M. 

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AUTHOR OF " ELEMENTS OF BOTANY," " FOUNDATIONS OF BOTANT,' 

 " PRIMER OF DARWINISM," ETC. 



BRADLEY M. DAVIS, PH.D. 



PROFESSOR OF BOTANY IN THE UNIVERSITY OF PENNSYLVANIA 



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GINN AND COMPANY 



BOSTON NEW YORK CHICAGO LONDON 

 ATLANTA DALLAS COLUMBUS SAN FRANCISCO 



