298 



ECOLOGY. 



drying, bristle out, and thus lift the seeds out of their en- 

 closure, when they are borne, buoyant as vapor, , bearing the 

 embryo plant, which is to take its place as a contestant in 

 the battle for existence. 



Fig. 251. 

 Seed distribution of virgin's bower (clematis). 



465. The virgin's bower. The virgin's bower (Clematis 

 virginiana), too, clambering over fence and shrub, makes a 



