SUPPRESSED EFFECTS 55 



ordinary single comb are xyS and xys ; and, since the 

 other combs in the set in which the single comb appeared 

 must also carry s, the characters of the five combs 

 considered so far are : 



and the eight combinations which can be made by the 

 three pairs of characters X and x, Y and y, and S and s, 

 and the kinds of combs which belong to them are : 



XYS Walnut comb, split. 



XYs Walnut comb. 



Xy S Rose comb, split. 



Xy s Rose comb. 



X YS Pea comb, split. 



X Ys Pea comb. 



X y S Single comb, split, i.e. the Cairo comb. 



xys Single comb. 



The other kind of comb found by Professors Bateson 

 and Punnett belonged to a Dutch breed called the 

 Breda. This comb was really no more than rudimen- 

 tary, but it disclosed another pair of characters. It 

 is described thus : "In the cocks there are two minute 

 papillae standing one on each side of the middle line, 

 which are rudiments of a comb structure. As experi- 

 ence shows, the hens have the duplicity of which these 

 papillae are the evidence, but in examination of the 

 heads of hens practically no comb tissue can be seen or 

 felt." 



