CHAPTER XII 



receptive surface may be brought against the outer, pollen-covered 

 surface, or against the pollen clinging to other parts, to tips of an- 

 thers, or to the corolla, or possibly to the long pappus. Of course 

 one will not force all these different conditions upon the attention of 

 the children. 



But children can think out for themselves the various purposes 

 served by the involucre, protection from moisture, cold, grazing ani- 

 mals, unbidden guests, and the like. Notice, too, that the involucre 

 makes it impossible for insects to get honey by biting through the 

 corolla tubes. 



97 



