"Blossom Hosts and Insect Guests 



on a clump of the blossoms of the high-anther form 

 indicated below it. The black probe represents the 

 insect's tongue, which, as it seeks the nectar at the 

 bottom of the tube, gets dusted at its thickened top 

 with the pollen from the anthers. We next see 

 the insect flying away, the probe beneath indicating 

 the condition of its tongue. It next alights on 

 clump No. 2, in which the flowers happen to be of 

 the high-stigma form, as shown below. The tongue 

 now being inserted brings the pollen against the 

 high stigma, and fertilizes the flower, while at the 

 same time its tip comes in contact with the low 

 anthers, and gets pollen from them. We next see 

 the insect flying to clump No. 3, the condition of 

 its tongue being shown below. Clump No. 3 hap- 

 pens to be of the first low-stigma form of flowers, 

 and as the tongue is inserted the pollen at its tip 

 is carried directly to the low stigma, and l/u's flower 

 is fertilized from the pollen from the anthers on the 

 same level in the previous flower. And thus the 

 riddle is solved by the insect. From clump to 

 clump he flies, and through his help each one of 

 the pale blue blooms is sure to get its food, each 

 flower fertilized by the pollen of another. 



Another beautiful provision is seen in the differ- 

 ence in size of the pollen-grains of the two flowers, 



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