Phenomena of Inheritance 



79 



sons of the same race are much more closely related than this, 

 and certainly we need not go back to Adam nor even to Shem, 

 Ham, or Japheth to find our common ancestor. 



On the other hand we now know that we do not inherit equally 

 from all our ancestors; on the average we inherit about as many 

 traits from our fathers as from our mothers, but inheritance from 



63 



F.c. 25. SCHEME TO ILLUSTRATE GALTON'S "LAW OF FILIAL REGRESSION" 

 as shown in the stature of parents and children. The mean height of 

 all parents is shown by the dotted line between 68 and 69 inches. The 

 circles through which the diagonal line runs represent the heights of 

 graded grpups of parents and the arrow heads indicate the average heights 

 of their children. The offspring of undersized parents are taller and of 

 oversized parents are shorter than their respective parents. (After 

 Walter.) 



