56 



S. J. HOLMKS AND H. M. LOOMIS. 



young as compared with the adults than light brown, tow occur- 

 ring in twenty children and in none of the adults. The data 

 agree with ours in showing little change between the parents 

 and grandparents. It is evident that an investigation of the 

 heredity of hair color under the assumption that the juvenile con- 

 dition represents even an approximate record of heredity would 

 be much like a study of the inheritance of stature from measure- 

 ments of the height of school children. 



Any conformability of the results thus obtained with Mendelian 

 expectations, so far as ratios are concerned, means little. In fact 

 if the ratios were approximately Mendelian before the effects of 

 age were excluded they could not be Mendelian after the elimi- 

 nation of this factor. 



Table I. 

 Showing the Number of Cases of the Various Kinds of Eye Color Re- 

 sulting FROM Different Matings ; Bl, Blue ; Blk, Black ; 

 Br, Brown ; Gn, Green ; Gy, Gray ; Hz, Hazel. 



The data obtained (see Tables II. and III.) warrant us in con- 

 cluding that in the inheritance of colors depending on the gran- 

 ular dark brown pigment the same general tendencies prevail as 

 in the inheritance of eye color. Dark hair tends to be dominant 

 over the lighter colors. If both parents have dark hair the chil- 

 dren will be predominantly dark haired but a certain number of 

 light-haired children may appear. If one parent is dark haired 

 and the other light haired both dark-haired and Hpfht-haired chil- 



