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Nearly every species of orchid has a way of its own 

 for compelling visiting insects to work for thenij so that 

 there is practically an unlimited fields for the observer 

 along these lines. I will mention but one other, the 

 common pink ^Moccasin Flower or Ladies Slipper. That 

 most useful of insects, the bumblebee, is the one that we 

 shall see visiting the jNIoccasin Flower. He knows that 

 there is plenty of food inside the handsome pink sac. The 

 only entrance for him is in the fissure in the front; after 

 considerable struggling he is able to force his burly frame 

 through and the opening closes behind him. 



Dinner finished, the next thing is to get out; he looks up 

 to the base of the flower where two spots of light show, — 

 that is the way. He struggles along the narrowing passage 

 past an obstructing stigma that brushes from his back any 

 pollen that he may have received from the last "slipper" 

 visited. Continuing along the passage, he reaches an 

 anther waiting to clap a fresh load of pollen on him; thus, 

 fully charged, he emerges and flies to the next plant to 

 repeat the operation. 



