PLATE 53 



Fig. 1. Portion of pedicel of Lycopersicum, showing groove and separation 

 zone. 



Fig. 2. Portion of cortex of pedicel of Lycopcrsicvm, showing groove and 

 abscission process fairly well along; cell sei)aration first takes place between 

 only two tiers of cells before sjireading to others. 



428 



