250 PLANT LIFE 
processes within the parent organism. Inci- 
dentally, however, as the wing-like structure 
dries up, its adaptedness for assisting dispersal 
may become of inestimable value to the 
species. 
The individual has its duty to itself, and 
its own immediate success is measured by 
the completeness with which it is adapted 
to overcome the difficulties that beset it— 
difficulties that arise partly from within, and 
partly also from without—and so to emerge 
victorious in the struggle for existence. But 
unless it is so constructed as to launch a 
successful posterity on the world, its race is 
destined in the long run to perish, and “ The 
place thereof shall know it no more.” 
