c. 



COLLEGE BOTANY 



STRUCTURE, PHYSIOLOGY AND 

 ECONOMICS OF PLANTS 



BY 



MELVILLE THURSTON COOK, PH.D. 



RUTGERS COLLEGE, N. J. 

 AUTHOR OF APPLIED ECONOMIC BOTANY 



286 ILLUSTRATIONS 



PHILADELPHIA AND LONDON 

 J. B. LIPPINCOTT COMPANY 



