HUMAN EYE COLOUR 49 



eyes, but both descended from (of course, hybrid) 

 duplex parents on both sides in both cases, will 

 possess blue eyes as certainly as if their four grand- 

 parents all had blue eyes. The offspring of the 

 union of two persons with simplex eyes, whatever 

 their ancestry is, will never have brown eyes. At 

 any rate, no exceptions to this rule have yet been 

 observed and recorded. 



