ii8 A NATURALIST IN THE PACIFIC ch. xii 



plants, as with Scsevola Koenigii, the drupes of which are equally 

 well fitted for dispersal by birds and currents. 



(7) The same general principles have been at work in determin- 

 ing the structures concerned with the buoyancy of the fruits and 

 seeds of British littoral plants. Although the species are few in 

 number they exhibit in this respect great variety, eight species 

 illustrating six or seven types of buoyant structure. 



