204 THE AMERICAN NATURALIST [Vol. XLII1 



dominates over its absence it is frequently completely 

 hidden by black or even dark brown. In consequence 

 of the cooperation of these two causes we are not sur- 

 prised to find considerably more than half of the offspring 

 (70 per cent.) showing no red. 



Table IX. Distribution of Hair Color in the Offspring when the 

 Parents have Dark Hair Containing Hypostatic Bed. 

 (a) Both Parents Have Hypostatic Red 



I 



Kel 

 Smi-D 

 Totals 



H 



* * 1 i § £ 



i i 

 i i i 



1 2 

 1 3 



dk.br. dk.br. dk.br. It. red dk.br. red 

 dk.br. dk.br. chest. N. chest. - 

 N. N. - - — — 

 dk.br. K N. chest, chest, chest. 



2 1 2 4 3 



(6) Only One Parent is Known to Have Hypostatic Red. 



Beo-A 

 Dev 



2 12 5 



3 3 2 

 11 11 

 114 3 1 



dk.br. X. lt.br. N. - red 

 X. dk.br. X. chest. dk.br. N. 

 X. X. N. X. X. red 

 N. N. red dk.br. N. N. 



X. dk.br. N. dk.red - dk.br. 

 N. X. dk.red N. lt.br. N. 

 N. dk.br. dk.br. gold chest, gold 







Tables VIII to X give data for answering the very 

 difficult question of inheritance of red when associated 

 with melanic pigment. The chief difficulty is due to the 

 masking of the diffuse by the more intense granular 

 pigment. The following results seem, despite this diffi- 

 culty, established. 



1. Two light-haired parents whose hair is without red 

 will have no red-haired children (Table I). 



2. When one parent only forms "red hair" gametes, 

 while the other forms exclusively gametes containing the 

 darker phases of melanic pigmentation, the offspring will 

 show no red hair; a fortiori, if neither parent forms "red 

 hair" gametes, no red hair will appear in the offspring. 

 (Table IX, b; compare also Tables IV, V, VI and VII.) 



