The Swaying Iris 



Having backed out of this segment of the blossom 

 as shown at A, he proceeds to the next ; but the 

 shelf-hke stigma awaits him at the door, and scrapes 

 off or rubs off a few grains of the pollen from his back 

 (B). Thus he continues until the third segment is 

 reached, from which he carries away a fresh load of 



pollen to another flower. It will be seen that only 

 the outer side of this appendage is stigmatic, and 

 that it is thus naturally impossible for the blue-flag 

 to self-fertilize — only one instance of thousands in 

 which the anther and stigma, though placed in 



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