BOOTING. 



51 



have the shanks feathered, on account of imperfect dominance of the heter- 

 ozygotes. Actually all have feathered feet. These statistics thus confirm the 

 view of the dominance of the inhibiting factor. Were clean shank recessive, 

 then the DR X R crosses must give 50 per cent clean-footed and probably 

 over. The actual result, none clean-footed, is not in accord with the latter 

 assumption. 



Table 36. DistribxUion of boot-grade in DRxD (non-booted) crosses. 



Pen 



No. 



Mother. 



No. 



653 508 

 653 508 



653 

 653 



577 

 577 



653 587 

 653 I 587 

 653 635 

 653 \ 635 

 653 ' 652 

 653 652 



653 

 653 

 653 

 653 

 653 

 653 

 653 

 653 



691 

 705 

 705 

 713 

 713 

 760 

 760 

 799 



^661 635 

 661 635 



p6l 

 661 

 661 

 661 



Gen. 



Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 

 Fi 



f, 



Fi 

 Fi 

 Fi 



Races. 



Fi 



F, 



1 Fi 



691 Fi 



799 Fi 



799 Fi 



Wh. Legh. X Bf . Coch. 



....Do 



RXBl. Coch 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



...Do 



Grade. 



Father. 



Pr. 

 Pr. 



3 



3 



1 



1 



3 



3 



S 



5 

 Pr. 



2 



2 

 Pr. 

 Pr. 

 Pr. 

 Pr. 



3 



Grade. 



Boot-grade in offspring. 



Present. 



Total (143) . 



Bf. Coch. X Game. 



.Do 



.Do 



.Do 



.Do 



.Do 



Slight. 



34 



42 



Total (23) 



Grand total (166). 



14 



48 





 42 



Absent. 



67 



9 



76 



Per cent, 

 present. 



46.2 

 26.7 

 87.5 

 33.3 

 57.1 

 25.0 

 85.7 

 20.0 

 23.5 

 40.0 

 20.0 

 50.0 

 71.4 

 100.0 

 60.0 

 60.0 

 40.0 

 60.0 



46.9 



66.7 

 33.3 

 50.0 

 33.3 

 40.0 

 20.0 



39.1 

 45.8 



* Pure-blooded SUkie assumed heterozygous in boot. 



Numerous observations have been made upon the progeny of parents 

 belonging to hybrid generations beyond the first. Owing to the extreme 

 imperfection of dominance it is rarely possible to say with certainty from 

 inspection whether a given bird has germ-cells dominant or recessive, or 



