THE PHOTOPERIODICTY OF FLOWERING UNDER 

 SHORT DAY WITH SUPPLEMENTAL LIGHT OF 

 DIFFERENT WAVE LENGTHS, by G. L. Funke 79 



References °^ 



NUTRITION AND METABOLISM AS RELATED TO 



PHOTOPERIODISM, by A. E. Murneek 83 



References "0 



ANATOMICAL AND HISTOLOGICAL CHANGES IN 

 RELATION TO VERNALIZATION AND PHOTO- 

 PERIODISM, by R. H. Roberts and B, Esther Struckmeyer 91 



Experimental Evidence 91 



New Evidence "'^ 



Literature "^ 



Plant Differences "6 



After-Affect 97 



Monocotyledons "7 



Histology "' 



Role of Anatomy 98 



Phytohormones 98 



Relation with Photoperiodism 98 



Relation with Vernalization 99 



Relation with Phasic Development 99 



Comment 99 



References ^^^ 



LENGTH OF DAY IN THE CLIMATES OF PAST GEO- 

 LOGICAL ERAS AND ITS POSSIBLE EFFECTS UP- 

 ON CHANGES IN PLANT LIFE, by H. A. Allard 101 



Introduction lOl 



Ancient Climatic Cycles 102 



The Length-of-Day Factor of Climate and Plant Life 103 



The Cretaceous Flora 105 



Changes in Plant Life in Tertiary Time 107 



Seasonal Cycles in Tertiary Climate and the Re- 

 sponses of Plant Life 108 



Subsequent Dispersal of the Tertiary Herbaceous 



Angiosperms 110 



Development of the Climbing Habit 114 



Length-of-Day Responses of the Woody Angiosperms 114 



Conclusions 115 



References 1 19 



VERNALIZATION AND PHOTOPERIODISM IN THE 



TROPICS, by S. M, Sircar 121 



Rice (Orysa sativa L.) 121 



Wheat (Triticum vulgare Vill.) 123 



Mustard (Brassica spp.) 124 



Miscellaneous Crops 125 



Gram (Cicer aricthiuin L.) 125 



Jute (Corchorus capsularis L. and C. olitorius L.) 126 



Cotton ( Cossyphim spp. ) 1 26 



Sugarcane (Saccharum officinarum L.) 126 



Soy bean (Glycine hispida Maxim.) 126 



7377;. 



