734 



THE AMEBIC AN NATURALIST 



[Vol. XLIX 



The numbers from the cross of piebald X black-eyed 

 white are more extensive and closely approximate a 1 : 1 

 ratio. The numbers obtained are 105 black-eyed whites 

 and 102 piebald, while the 103 of each would have been 

 exactly an equality ratio. 



The behavior of the piebald animals when crossed inter 

 se is exactly what would be expected if piebald was hypo- 

 static to black-eyed white and distinct from it in inheri- 

 tance. 



The next question to be considered is the relation of 

 black-eyed white to ' ' self ' ' or solid coat, in inheritance. 



Kelation of Black-eyed White to Self 

 A preliminary investigation of this question has been 

 made. The "self" race used was really technically not 

 a "self" but genetically it carried neither the black-eyed 

 white nor piebald spotting factors. Somatically the self 

 race used was a "blaze" race of the type which I have 

 previously put on record. Further crosses which I have 

 made between black-eyed whites and true selfs have 

 shown, even in early stages, clear evidence that the be- 

 havior of the blaze and true self races is directly com- 

 parable. 



1. "Self" X Black-eyed White 

 The F x generation produced by crossing self (blaze 

 F6B) animals with black-eyed whites consists of two very 

 distinct forms. These have been produced in a ratio of 

 50 Type "A" to 47 Type " B. " The first of these, Type 

 "A," is shown in Fig. 5. While the percentage of dorsal 

 pigmentation of this type is subject to some variation 

 (see table), it will be noticed that they are ordinarily be- 

 tween 80 and 90 per cent, colored. The spots of color 



Type "A" 



I I 



3 8 



1 



I 







I 





I 



I 



8 













| 















Black-eyed white X self (blaze) 

















15 









