56 



INHERITANCE OF CHARACTERISTICS IN DOMESTIC FOWL. 

 Table 42. DB x DB crosses. 



Table 43. ID x DD {Silkie crosses). 



Table 44 shows clearly, first, that there are families of two booted 

 parents that never fail to produce booted offspring. There is, hov/ever, 

 even in pure-bred booted races, a marked variability in the grade of booting, 

 extending from 3 (or 4) to 10. The significance of this variability must be 

 left for future investigations. There is in the least boot, as it were, an 

 extension of the field of activity of the feather-inhibiting factor that is 

 always present on the hinder aspect of the shank, so that it interferes with 

 the development of feathers on the inner face of the shank also. 



