1918] Kendall: Ahscission of Flowers and Fruits in Solanaceae 395 



two to four days. Severe iiijurj^ of an}- 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 injurj- and 

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

 ovarv, 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 o 



Effect op Different Types of Injury in Causing Flower fall in 



Lycopersicum esculentum 



