158 Bulletin No. 155. — 1913. 



less Game. ''Of 26 hj^brids between Black Cochin and White Leg- 

 horn, 8 were barred black and white, and these belonged equally to 

 the two sexes." 



With reference to barring, Davenport in his 1906 report concludes 

 as follows: ''Barring is a heterozygous condition found in hybrids 

 from a white and black parent. It is provisionally regarded as a 

 form of particulate inheritance as opposed to the alternative in- 

 heritance of the Leghorn X Minorca cross. This heterozygous con- 

 dition when interbred, usually breaks up into white, uniformly 

 pigmented, and barred, as in the case of the Tosa X White Cochin 

 hybrids." As to the inheritance of white and dark plumage, Daven- 

 port states : "Aside from cases of barring and Andalusian coloration, 

 white usually dominates over dark plumage. This is true in all cases 

 where White Leghorn is emploj^ed as a white race, whether the other 

 race is Game, Dark Brahma, Houdan or Minorca. When the Silky 

 is used as the white race, white is sometimes recessive, but it must be 

 acknowledged that the dark parents were not the same as were used 

 with the Leghorn, but were a Game, Frizzle and Jungle fowl; con- 

 sequently the results in the two series are not strictly comparable ► 

 . . . It is hardly conceivable that the white of the Silky is different 

 from that of the Leghorn; so it must be concluded that the white 

 inherited as a solid color is sometimes dominant and sometimes 

 recessive, depending upon the race in which it inheres." On this 

 point, we now have further light as will be indicated later in this 

 paper. 



In Davenport's later report (1909) upon inheritance of character- 

 istics in domestic fowl, the application of the factor hypothesis is 

 strongly evident, and, in the light of later researches, several of his 

 earlier conclusions are modified or the results receive a somewhat 

 different interpretation. 



Among the Black X White crosses reported in this paper is the 

 cross White Leghorn (d^?) X Black Minorca ( 9 ?)• In 154 offspring 

 there appeared 116 white, black-white, or blue, and 38 black. Some 

 of the latter contained more or less white, and among them were four 



