MORGAN AND GOOD ALE, INHERITANCE IN POULTRY 129 



There were also two barred birds whose sex was omitted by mistake 

 in the records. The expectation is three barred to one black, which is 

 closely realized. 



Back Cross of F 1 Black 9 to Langshan $ . — Five black hens were 

 bred to a Langshan cock of the same strain bnt not the actual father of 

 these hens. Another black hen that came from a similar cross with a 

 Plymouth Bock was also present in the same pen, so that some of the 

 offspring may have come from this hen also. There were 18 black young, 

 of which 11 were males and 7 females. In addition, however, there was 

 one barred chick. Now, the black hens had been with a barred cock to 

 give the F 2 generation. They had been for three weeks with the Lang- 

 shan male before the eggs fertilized by the black cock were kept for 

 incubation. There can be little doubt that one of the spermatozoa of the 

 original male had carried over and produced this bird. If this case is 

 thrown out, the results are consistent. 



Other Features of the Grosses. — The Langshans have feathered tarsus 

 (booted) ; the Dominiques have clean shanks. All of the F x s recorded 

 were booted, though not strongly. In the F 2 generation, there were 14 

 booted and 1 1 clean shank, distributed as follows : 



Booted Clean 





5 

 7 



$ 

 2 



i 

 1 



s 



2 



Black 



1 



4 



5 



3 



It is clear that booted shanks dominate 6 but imperfectly in this cross, 

 as in other crosses of poultry. Some of the F 2 offspring had heavily 

 booted legs ; others were like the ¥ 1 generation. No sharp line between 

 the classes in the F 2 generation could be drawn. 



There is no evidence of any association here between black and booted 

 (the paternal combination) and barred and clean-shanked (the maternal 

 combination). 



When the barred and booted Y 1 male was bred to four Dominique 

 hens, the results are shown in the next table : 



Booted Clean 





5 

 6 



1 



t 

 5 

 1 



<5 

 4 



Black 



1 







3 







In tbe sense that an inhibitor is present in clean shanks. 



