138 PLANT PHYSIOLOGY 



collect and examine as many different types of plant diseases 

 as he can find, for the mere ability to recognize diseased condi- 

 tions is of great value. 



REFERENCE BOOKS 



C. R. BARNES, Physiology (in Text-book of Botany by Coulter, 



Barnes & Cowles), Chicago, 1910. 



L. JOST, Lectures on Plant Physiology (Engl. Ed., Oxford, 1909). 

 W. PFEFFER, The Physiology of Plants (Engl. Ed., Oxford, 1900- 



1906). 



B. M. DUGGAR, Plant Physiology, 1911, New York. 

 R. J. POOL , Suggestions for Experiments in Plant Physiology, 



1914, Lincoln. 

 For the chemical aspects of this chapter and especially for the 



following chapter the following books are useful. 

 HAAS AND HILL, Introduction to the chemistry of Plant Products 



1913, New York. 

 F. CZAPEK, Biochemie der Pflanzen, 1913, Jena. 



