Chap. VI. CORYANTIIES. 177 



by carrying them away, effect a union between two 

 flowers, generally on distinct plants. This can hardly 

 fail to occur in all the many cases in which the pollinia 

 slowly change their ^^osition, when removed from the 

 rostellum, in order to assume a proper direction for 

 striking the stigma ; for the insects during this in- 

 terval will have had time to fly from the flowers on 

 one plant which will serve as the male, to thosa 

 on another plant which will serve as the female. 



:5r 



