POLLINATION 



307 



pollen to fertilize all 

 their ovules, for none 

 is lost, and the pistil 

 and stamen are placed 

 in such a position that 

 pollination is sure to 

 occur. 



Other plants, as some 

 of the lilies, are ar- 

 ranged for cross-ferti- 

 lization, but if that fails, 

 they can pollinate them- 

 selves. An Easter lily 

 at first keeps its three- 

 parted stigma carefully 

 closed until it is well 

 out of the way of the 

 anthers (Figure 318, a). 

 Then the stigma opens 

 out, exposing its sticky surfaces to the air and to insects 

 which may visit the flower (Figure 318, h ). If no pi 'lieu is 

 brought to the stigma, however, the plant brings the pistil 

 up until the stigmas almost touch some of its own anthers 



Figure 319. — Fruit of the Bean. 

 A pod. 



Figure 320. — Fruit of the Corn. 

 Kernels or grains. 



