26 



INHERITANCE OP CHARACTERISTICS IN DOMESTIC FOWL. 



On the other hand, in the former families there are less than half as 

 many offspring with only 4 toes as in the latter. Classifjdng "reduced" 

 forms with their proper advanced type, we find highly polydactyl parents 

 yielding only 16 per cent non-polydactyl offspring, while slightly polydactyl 

 parents yield 43 per cent non-polydactyl offspring. The percentage of 

 polydactylous young diminishes with the size and distinctness of the extra 

 toes and the grades of the polydactyl offspring are lower (absence in table 

 22, 6, of 6 toes). Both of Castle's conclusions seem to be confirmed. 



Tabls 20. — Distribution of toe-types in the offspring of "good " extra-toed parents. 



Ser- 

 ial 

 No. 



Pen 

 No. 



728 

 728 

 728 

 728 

 728 



813 

 813 

 S13 

 813 

 S13 

 813 

 813 

 813 

 813 



Mother. 



No. Gen. Races. 



2271 



912 



2248 



2272 



174 



2271 

 6113 



377 

 5122 



935 

 2272 



912 

 7320 

 5142 



Wh.Legh.XHoud. 



Do 



....Do 



....Do 



....Do 



Totals (169).. 

 Percentages , . 



Father. 



No. Gen. Races. 



258 

 258 

 258 

 258 

 258 



Houd.XWh.Legh. 



....Do 



....Do 



....Do 



....Do 



Mating. 



Absolute numbers. 



4r-4 



DDXDR 

 DRXDR 

 DDXDR 

 DRXDR 

 DRXDR 



Houd.XWh.Legh. 



....Do 



....Do 



....Do 



....Do 



....Do 



....Do 



....Do 



....Do 



DXD 

 DXD 

 DRXD 

 DXD 

 DRXD 

 DRXD 

 DRXD 

 DRXD 

 DRXD 



Totals (205) 



Percentages 



44 

 26.0 



22 

 10.7 



4-5 



22 

 10.7 



5-5 



113 

 66.9 



167 

 76-5 



5-6 



6-6 



Aver- 

 age. 



9.66 

 9.55 

 9.42 

 9.31 

 9.19 



9.41 



9.94 

 9.89 

 9.68 

 9.65 

 9.53 

 9.52 

 9.35 

 9.35 

 9.28 



9.70 



Theoretical classification. 



43 

 26.4 



sd. d'd' d'd. dd. dV. dt'. dt. ft', tt. q't. 



110 

 65.2 



156 

 76.2 



* No. 2016 has 4-4 toes and is a hybrid between a 5-toed White Leghorn X Houdan and a 4-toed Minorca X Polish, 



