THE INITIATION OF THE REPRODUCTIVE PROCESSES 



189 



In Relation to Position. — Not all fruit buds are differentiated simul- 

 taneously, even on the same tree. Investigations by Goff"^ convinced 

 him that in the apple and pear fruit-bud formation may occur after the 



Fig. 24. — Stages in fruit bud development of the Yellow Newtown apple. Above, to 

 the left Sept. 10, to the right Nov. 25; below, to the left Feb. 14, to the right Mar. 6. 

 (After Bradford.^') 



first of September; he suggested as alternatives either (1) two periods 

 of flower formation or (2) a continual differentiation through the season. 

 Bradford, working with the Yellow Newton apple, reports least variation 

 in spurs which have borne previously but are not bearing in the current 



