FRUITS AND COLONISATION BY SEED. 



53 



scopic ; and why should the rather unusual ''arils'' of 

 the Yew, Woodsorrel, and White Water-lily become 

 specialised for dispersal ? Hairs, and even hooks or 

 clinging parts are by no means uncommon, they 

 are indeed characteristics of certain orders ; but 

 these special modifications, which, it must be re- 

 membered, are only of use when they are perfectly 



