72 INHERITANCE IN POULTRY. 



The result is peculiar. Usually the vulture hock is absent iu the first 

 hybrids, indicating its recessiveuess. In crosses with a particular race — 

 Tosa fowl — however, there is no recessiveuess. It is probable that the Tosa 

 fowl is heterozygous iu respect of this characteristic. The new character- 

 istic is recessive, but imperfectly so. 



FOOT FEATHERING. 



Foot feathering, as the discussion on page 34 indicated, is a positive vari- 

 ation, new to Gallus, but not of a pathological sort. Common among wild, 

 scratching birds, its occurrence in Gallus may be regarded as a case of de- 

 gressive variation (de Vries). The distribution of its occurrence is as follows : 



The foregoing statistics tell only a part of the story. Booting, when 

 present, is frequently much reduced ; one may regard absence of booting as 

 the extreme condition. Booting is dominant, but usually imperfectly so. 



EXTRA TOES. 



The extra toe is a positive variation of a teratological sort, 

 tion of its occurrence is as follows : 



The distribu- 



