166 



Physiological Pre-determlnation 



Table VIII. 



1 . tSeeds sown in garden soil rich in humus. 

 100 seeds sown in each experiment. 



2. Seeds soivn in a poor sandy soil. 

 100 seeds sown in each experiment. 



* The columns I, II, III, and IV correspond to those shown in Table VI. 



Table IX. 



Stage of ripeness at which 

 the seed was harvested 



Seed in the dough stage 

 Seed in the hard dough stage 

 Seed ripe 



Yield in bushels 

 per acre 



38-99 

 28-68 

 26-66 



Zavitz(2i&25) gave the average results of five years' experiments 

 with winter wheat in which the yield obtained from seed which was 

 allowed to become thoroughly ripened before it was harvested was 

 compared with that obtained from seed harvested at various stages of 

 immaturity. The thoroughly ripened seed gave a better yield both of 

 grain and of straw and a heavier weight of grain per measured bushel 

 than that produced from grain harvested at either of the earlier stages of 

 maturitv. 



