DEDICATION 



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

 tribute to Charles Darwin, but 7 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 I 



