vni HEREDITY 149 



We have now examined the nature of the problems which 

 the non- measurable characters present. The general 

 trend of the evidence is to show that inheritance becomes 

 more complex as the crossed parents are less and less 

 closely related. The amount of labour which the author 

 has been able to apply to these problems, under the 

 limitations imposed by natural crossing and accidental 

 circumstances, has not been enough to produce one clean 

 and indisputable proof for any character. Nevertheless, 

 he believes that the preceding discussion will be found by 

 later workers to represent the general position of a 

 complex subject. 



