K. C. PuNNETT AND M. S. Pease 237 



derived from the Campine, and it suggests that barring is not always 

 completely recessive to self colour. We should add that the data we 

 have accumulated afford no evidence for supposing that the Hamburgh- 

 Campine barring is in any way sex-linked. 



We must suppose therefore that there are at any rate two forms of 

 barring in poultry, of which one is sex-linked and dominant to self 

 colour, while the other is more or less recessive to self colour, and does 

 not exhibit sex-linkage. The position appeared to us so curious that 

 we have started a series of experiments to try and determine whether 

 there is any relation between these two groups of barring, and if so, 

 what that relation is. For, on the face of it, it seems unlikely that a 

 peculiar and rhythmical pattern such as barring should be brought 

 about in two entirely independent ways. It is obvious that the most 

 direct way of attacking the problem is to cross birds of the Rock type 

 with those of the Hamburgh-Campine type, and to caiTy out an ordinary 

 genetic analysis. This we have already commenced, but it must be 

 several years before we can hope to complete our analysis. At the same 

 time we have been investigating the inter-relation of the different forms 

 of barring in the Campine itself, and it is with a result obtained here 

 that the present note is concerned. 



The barred breeds of both Hamburghs and Campines are well known 

 in their gold and silver varieties, and a description of these will be found 

 in any work dealing with the breeds of poultry. In the former the alter- 

 nating bars are black and gold; in the latter black and white. Recently, 

 through the enterprise of the Rev. E. Lewis Jones, the recognised autho- 

 rity on Campines, a third barred form has been introduced. This is the 

 "Chamois" Campine, in which the alternating bars are white and gold^ 

 The relation between the Gold and the Silver Campine is that which 

 exists between the corresponding gold and silver forms of other varieties. 

 Silver is dominant to gold, and is sex-linked. This we proved some 

 years ago for the gold and silver-pencilled Hamburghs, and our more 

 recent experiments shew it to be true also for the Campines. The white 

 bars in the Silver Campine correspond with the gold bars in the Gold 

 Campine, and the black bars in the one to the black bars in the other. 

 The point then arises as to the correspondence of the white and gold 

 bars of the Chamois with the black and gold of the gold, and the black 

 and white of the silver. In order to decide this we made the following 

 crosses during the past season. 



^ Through the kindness of Mr Lewis Jones we obtained a few of these birds for experi- 

 ment, and for this we wish to express our sincere thanks. 



Journ. of Gen. xi X6 



