18 



THE ROYAL SOCIETY OF CANADA 



Fig. 1. Growth records of a fruit (No. 2) of Juglans calif ornica quercina for 11 

 days. During the latter part of the period abscission took place. 



J^ayj z J ^ ^ 6 / 6 p 



Fig. 2. Graph integrating the record in Fig. 1 (June) and of Fig. 3 (July). The 

 durations of the periods of shrinkage of fruit No. 2 (Fig. 1) are indicated by the 

 vertical lines of the inset. 



