26 



INHERITANCE OF CHARACTERISTICS IN DOMESTIC FOWL. 



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

 manj^ offspring with only 4 toes as in the latter. Classifying "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, b, of 6 toes). Both of Castle's conclusions seem to be confirmed. 



Table 20. Distribution oj toe-types in the offspring of "good " extra-toed parents. 



Pen 

 No. 



1 728 



2 728 



3 728 

 1 728 2272 

 5 728 174 



Mother. 



No. Gen. 



2271 



912 



2248 



6 !813 



7 1813 

 S ;813 

 D ,813 



813 



1 813 



2 813 



3 813 



4 813 



2271 

 5113 



377 

 5122 



935 

 2272 



912 

 7320 

 5142 



Races. 



Wh.Legh.XHoud 



Do... 



....Do... 

 ....Do... 

 Do... 



Totals (169). 

 Percentagea . 



Father. 



No. Gen. 



258 Fi 



258 Fi 



258 Fi 



258 Fi 



258 Fi 



Races. 



Houd.XWh.Legh. 



Do 



....Do 



Do 



....Do 



Mating. 



DDXDR 

 DRXDR 

 DDXDR 

 DRXDR 

 DRXDR 



Totals (205). 

 Percentages. . 



Houd.XWh.Legh.] DXD 



Do I DXD 



Do DRXD 



Do I DXD 



Do j DRXD 



Do 1 DRXD 



..Do 



..Do 



....Do 



DRXD 

 DRXD 

 DRXD 



Absolute numbers. 



4-4 



44 

 260 



22 

 10.7 



4-5 



22 

 10.7 



5-5 



21 

 21 

 22 

 34 

 15 



113 



60.9 



157 

 76.5 



5-6 



6-6 



Aver- 

 age. 



9.65 

 9.55 

 9.42 

 9.31 

 9.19 



9.41 



9.94 

 9.89 

 9.08 

 9.55 

 9.63 

 9.52 

 9.35 

 9.35 

 9.28 



9.70 



Theoietical classification. 



43 

 25.4 



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



110 

 65.2 



156 

 76.2 



2 



1.0 .. 



1 

 0.5 



* 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. 



