1918] Kendall: Abscission of Flowers and Fruits in Solcmaceae 395 



two to four days. Severe injury of any kind to the ovary causes fall 

 in one to two days. 



The figures given above for the reaction time in cases of abscission 

 following mechanical injury, together with a more detailed considera- 

 tion of the tables, indicate that the reaction time, in general, does not 

 depend so much on the type of injury as on the age of the flower 

 concerned. What connection there is between the type of injury and 

 the reaction time seems to be based, except in cases of injury to the 

 ovary, on the relation of the amount of material removed to the 

 amount remaining. Thus, cutting off the flower at the tip of the 

 pedicel causes abscission of the remaining pedicel more quickly than 

 any other type of injury. One exception to this statement is seen, as 



TABLE 5 



Effect of Different Types of Injury in Causing Flower fall in 



Lycopersicum esculentrtm 











Avg. No. 



No. 

 tiowers 



Size or 





Injury to 



days before 



condition 

 of flowers 







fall of 















remaining 







Calyx 



Corolla 



Stamens 



Pistil 



Pedicel 



organs 



J 



' 4 



I 



all cut 











no fall 



4 



II -VIII 



" 











" 





. 6 



XII 



1 1 











" 





' 3 



XII 









entire 

 ovary cut 





2 





3 



XII1-XIV 









ovary 

 punctured 

 4 times on 





no fall 



b- 













top 







1 



XII 









1 1 





3 





4 



XII 









ovary 



punctured 



4 times on 



side 





o 





. 3 



XIV 









" 





no fall 





' 4 



II 



punctured 

 at base 



punctured 





ovary 

 punctured 





9 



" 













once on 

















side 









l 4 



VIII 



1 1 



" 





" 





4 





' 4 



n-vm 



i cut 



i cut 









no fall 





4 



VIII-IX 



" 



(< 





" 





5 



a. 



3 



I 



i-ii 



VIII 



" 



1 1 





ovary i cut 





1 

 3 





IX 



1 1 



" 





i < 





2 



e 5 



I-IX 



" 





all cut 







no fall 



<{t 



VIII 









style cut 





5 



XXI 









" 





no fall 



g 5 



VIII -XIV 











slit 



1 1 





r 3 



VIII 





all cut 



( I 







4 



h- 



5 



4 



II-VIII 





it 









no fall 



