TABLE OF CONTENTS Xlll 



Factors Influencing the Growth of Plant Embryos 253 



Nancy Kent Ziebur, University of Wisconsin 



Growth Substances and the Formation of Buds in Plant Tis- 

 sues 263 

 Folke Skoog and Cheng Tsui, University of Wisconsin 



The Development of Stems and Leaves 287 



F. W. Went, California Institute of Technology 



GROWTH SUBSTANCES IN 

 REPRODUCTIVE DEVELOPMENT 



Chemical Regulation of Sexual Processes in Fungi 301 



John R. Raper, University of Chicago 



The Sexual Substances of Algae 315 



Gilbert M. Smith, Stanford University 



Growth-Regulating Substances in Relation to Reproduction 

 OF Some Horticultural Plants 329 



A. E. Murneek, University of Missouri 



The Induction of Flowering with a Plant Extract 347 



R. H. Roberts, University of Wisconsin 



Fruit Development as Influenced by Growth Hormones 351 



Felix G. Gustafson, University of Michigan 



The Growth Hormone Mechanism in Fruit Development 357 



Robert M. Muir, University of Iowa 

 Growth Substances in Fruit Setting 365 



S. H. Wittwer, Michigan State College 



GROWTH SUBSTANCES IN 

 PATHOLOGICAL GROWTH 



Experimental Induction and Inhibition of Overgrowths in 

 Plants 3°^ 



R. S. de Ropp, New Yor{ Botanical Garden 



In Vitro Experiments on Tissues of Pathological Origin 391 



Albert C. Hildebrandt, University of Wisconsin 

 The Interaction Between Causative Agents in Diseased 

 Growth 4^5 



A. J. Riker and J. E. Thomas, University of Wisconsin 



