No. 528] 



NOTES AND LITERATURE 



753 



"While the author recognizes sexual dimorphism as related to 

 Jungle Fowl pattern, he does not work out the manner of in- 

 heritance of this factor. He probably would have done so had 

 the birds been raised to the stage required for distinguishing 

 this dimorphism. 



Breeders of White Leghorns are frequently troubled by the 

 appearance of a reddish sheen on the feathers. The formula of 

 this breed gives a probable reason for this difficulty (T.JXWx ). 

 It is probable that the Jungle Fowl coloration produces the ef- 

 fect in question. The cross between this breed and the Buff 

 Cochin (CjnwX) gives an opportunity to get a breed of the 

 formula CjnWx, which ought to be a pure dominant white, with 



Goodale 5 has recently published a short but very interesting 

 paper giving results of poultry breeding experiments, in which 

 it appears that the Jungle Fowl pattern found in the Brown 

 Leghorns, like the barring factor of the Barred Plymouth Rocks, 

 is allelomorphic to the female sex factor. I lis paper also shows 

 that while dominant white, when homo/ygote. is epistatic to 

 black pigment, it is not so in the heterozygote condition of the 

 white. It also indicates that females possessing the Jungle 

 Fowl pattern and having Plymouth Rock white and Plymouth 

 Rock black pigment, both in the heterozygote condition, may 

 vary in color from black to almost typical Brown Leghorn 

 pattern. 



The progeny of females obtained by mating Brown Leghorn 

 females with white Plymouth Pock males show no trace of the 

 Jungle Fowl pattern or color, while the males obtained from this 

 cross transmitted the Jungle Fow l pattern. There is opportun- 

 ity here for a very interesting study. If the Jungle Fowl pat- 

 tern and the barring of the Plymouth Rocks are both allelomor- 

 phic to the female sex factor, it would be very interesting to 

 ascertain whether females can have hoth of these factors present 

 in them. If so, it would show either that the female sex factor 

 itself may be coupled with one or the other of these factors, or 

 that the allelomorph to this factor may contain both factors 



both of which behave as allelomorphs to the female sex ehro- 



Castle has recently shown' 1 that Miss McCracken's results in 

 *Proc. Soc. Exp. Biol, and Med., Vol. 7, No. 5, May 18, 1910. 

 •Castle, W. E., Jour, of Exp. Zool., Vol. 8, No. 2, March, 1910. 



