184 



opposed to, that of BA (variability). If, however, one of 

 the forces CA (isolation) is stronger than DA (heredity), and 

 is represented by the line EF, then the evolutionary direc- 

 tion of the body will be towards Y (divergent evolution). 



And whilst referring to the uniformity of type amongst 

 Australian aborigines, it is not to be inferred that there are 

 not a number of individual variations in personal appearance, 

 for Baldwin Spencer and Gillen remark that, whilst con- 

 forming generally to the usual Australian type of features, 

 there is very considerable difference between various indivi- 

 duals. In some the pronounced curve of the nose gave 

 superficially a certain Jewish aspect, though in many this 

 curve was wanting. It would, therefore, be quite possible by 

 a process of discriminate isolation ; that is, a breeding of 

 like with like, or those having characteristic resemblances, 

 to cause a divergent evolution from the common type. As 

 the authors quoted show, the tendency to variability is there, 

 and it is maintained that that is the initial motive power. 



With these few remarks I must draw this address to a 

 close by suggesting that an interesting investigation might 



