130 



THE FACTORS 



[Part 



between insular and continental conditions of life, and for paving the wa 

 towards an explanation of the more complex relations that affect ocean 

 islands. As on oceanic islands, so also on coast-islands, the relative numbi 

 of entomophilous species is smaller than on continents ; the mere separ; 

 tion of the coast-island from its adjacent mainland has consequent) 

 caused the disappearance of a portion of these species. At the san 

 time, a reduced number of insects is also noticeable. Both phenomer 

 are to be attributed to the strong winds, which on the one hand lesse 



Fig. 66. Angiaecum ebumeum, Thouars, in its native habitat. Seychelles. To the right 

 zingiberaceous plant. From a photograph by Brauer. 



the number of insects and the species of plants associated with the, 

 and on the other hand favour anemophilous flowers '. 



Up to the present time observations on the pollination of flowe, 

 with few exceptions, have been made only ,in temperate regions ; in \- 

 tropics, only a few and generally fragmentary observations have bcii 

 recorded, although many tropical forms of flowers appear to be adapt|l 

 to quite definite pollinators. From this point of view it is only necess; ' 



See p. 79. 



