LIST OF TABLES 



Duration of heat treatment by spring rye (un- 

 vernalized) and winter rye (vernalized) 25 



Ear development in same experiment after 6 weeks of 



LOW temperature '. 26 



Yield of grain and straw for Little Joss wheat 27 



Effect of treatment on grain yield in true spring 

 cereals 2/ 



Effect of vernalizing developing ears of Petkus winter 



RYE 2^ 



Vernalization of growing embryos in the developing ear 

 OF Petkus winter rye 35 



List of plant species and their behaviour in light of 



different wave lengths 80 



Changes in total nitrogen content of soybean plants, 



VAR. BiLOXI 86 



Rate of stem elongation of soybean plants, var. Biloxi 86 

 Effects of photoperiod on carbohydrate metabolism of 



soybean plants, var. Biloxi 87 



Carbohydrate-nitrogen relationships (ratios) in stems 



of soybean plants, var. Biloxi, when grown under 



certain photoperiods 88 



Phenology of Marquis wheat at Moro, Oregon 131 



Phenology of Marquis wheat in a number of North 



American areas 135 



Phenology of four varieties of flax in a number of 



North American areas 137 



Phenology of Alaska peas at College Park, Maryland. 139 

 Phenology of Alaska peas in a number of North 



American areas 140 



Phenology of Black Beauty eggplants in a number of 



North American areas 141 



Nicotiana tabaciim "Java," photoperiodisches Verhalten 176 

 Nicotiana tabamm Maryland-Mammut X Java, Verer- 



BUNG DER photoperiodischen Reaktionsweise 177 



