DEDICATION 



This short course of lectures on a great theme is a centenary 

 tribute to Charles Darwin, hut I wish also to ask the many 

 friends who made me no stranger in their country — men and 

 women of diverse opinions, at one however in their evolu- 

 tionist outlook and in their good-will — to lay it on the 

 threshold of United South Africa. Quod bonum, felix 

 fauetumque ait/ 



