PRACTICAL TEXT- BOOK 



OF 



PLANT PHYSIOLOGY 



BY 



DANIEL TREMBLY MACDOUGAL, PH.D. 



Director of the Laboratories of the New York Botanical Garden, 



WITH ONE HUNDRED AND FIFTY-NINE ILLUSTRATIONS. 



LONGMANS, GREEN, AND CO. 



91 AND 93 FIFTH AVENUE, NEW YORK, 



LONDON, BOMBAY AND CALCUTTA 



1908 



