CONTENTS 



Foreword, by K. V. Thimann vi 



Contents ix 



List of Tables xii 



List of Text Illustrations xiii 



List of Plates xiv 



HISTORY OF RESEARCH IN VERNALIZATION, 



by R. O. Whyte 1 



Introduction 1 



Chilling of Seed 2 



U.S.S.R 5 



Germany 16 



Great Britain 18 



Field experiment at East Mailing Research Station, 1942 26 



United States of America 28 



India 29 



Response to Temperature Before Seed Ripening 33 



Conclusion 37 



References 37 



HISTORY OF RESEARCH IN PHOTOPERIODISM, 



by A. E. Murneek 39 



Introduction 39 



Terminology 39 



Reviews on Photoperiodism and Related Subjects .... 40 



Discovery of Photoperiodism 41 



Classification and Adaptation 42 



Technique and Application 46 



Relation to Temperature 48 



Photoperiodic Induction 51 



Mechanism of Photoperiodism S3 



Conclusion 58 



References 59 



HORMONES IN RELATION TO VERNALIZATION 



AND PHOTOPERIODISM, by Karl C. Hamner 63 



Perception of the Photoperiodic Stimulus 63 



Transmission of the Photoperiodic Stimulus 65 



Vernalization 67 



Theories Regarding the Mechanism of the Formation 



OF a Flowering Hormone 68 



References 70 



WAVE LENGTH DEPENDENCE AND THE NATURE 

 OF PHOTOPERIODISM, by H. A. Borthwick, M. W. 



Parker and S. B. Hendricks 71 



References 77 



