XIV TABLE OF CONTENTS 



Deformities Caused by Insects 411 



T, C. Allen, University of Wisconsin 



Comparative Studies of Metabolism in Insect Galls and Nor- 

 mal Tissues 417 

 E. H. Newcomb, University of Wisconsin 



VITAMINS AND AMINO ACIDS AS GROWTH FACTORS 



Growth Factors in Bacterial Nutrition 431 



Esmond E. Snell, University of Wisconsin 



Genetic Aspects of Growth Responses in Fungi 447 



E. L. Tatum, Stanford University 



Vitamin and Amino Acid Requirements for the Growth of 

 Higher Plants 463 



William J. Robbins, New Yor\ Botanical Garden 



