XU CONTENTS 



1 6. The Development of Association and Climax Concepts, 

 Their Use in Interpretation of the Deciduous Forest, by 



E. Lucy Braun j2q 



17. Recent Evolution of Ecological Concepts in Relation to 



the Eastern Forests of North America, hy R. H. Whittaker J40 



18. Botanists and the Conservation of Natural Resources, by 



Paul B. Sears 559 



19. Soil-Plant Relationships and Plant Nutrition, by A. G. 

 Norman 367 



20. Physiological Aspects of Aging in Plants, by William J. 

 Robbins j8o 



21. Growth and Growth Hormones in Plants, by Kenneth 



V. Thimann jgi 



22. Weed Control: Applied Botany, by ^. 5. Crafts 405 



23. Horticulture Is a Great Green Carpet That Covers the 

 Earth, by H. B. Tukey 422 



24. Botany and Medicine, by H. W. Youngken, Jr. 442 



25. On the Popularization of Botany, by Donald Culross 



Peattie 456 



26. Botanical History, by Andrew Denny Rodger s III 467 



27. The Role of Study of Algae in the Development of 



Botany, by Gilbert M. Smith 471 



28. College Botany Could Come Alive, by Hiden T. Cox and 



John A. Behnke 484 



29. The Odor of Botany, by Harry J. Fuller 48 q 



30. Botany for Living, by Clarence J. Hylander 4gy 



31. More Plants for Man, by W. H. Hodge 504 



32. Botanical Aspects of the Paper-pulp and Tanning 

 Industries in the United States, An Economic and 

 Historical Survey, by Edmund H. Fulling §08 



33. Botanic Gardens — What Role Today? An "Operation 

 Bootstraps" Opportunity for Botanists, by George S. 



Avery, Jr. 5j<5 



34. Arboreta and Botanical Gardens in the Field of Plant 

 Sciences and Human Welfare, hy R. J. Seibert 545 



