R. C. PUNNETT AND THE LATE MaJOR P. Gr. BaILBY 281 



and there is no reason for supposing that it was in any way related to 

 our original stock. Of the ^i birds the cockerels were very similar to 

 those bred from Brown Leghorn $. The pullets however had orange 

 eyes, though often with a few small patches of pigment, and their shanks 

 were horn on light instead of horn on slaty. This is doubtless due to 

 the Leghorn </ having been homozygous for the inhibitor for which we 

 found the Leghorn $ heterozygous. Of interest here is the fact that 

 the distribution of egg colours in the F2 pullets^ raised from this cross 

 was quite different from that found in the reciprocal. As Fig. 2 shows 



1 23 456 789 10 11 

 Fig. 2. Distribution of grades of egg-colour in F^ generation 

 ex Langshan 5 x Brown Leghorn ^ . 



the range is complete, from white to grade 11; but there is no excess of 

 white and light tinted eggs as in the previous case. The mean grade 

 is higher here than in Fig. 1, viz. 6"0 as compared with 3*7. It should 

 be stated that the ^1 $ $ ex Langshan $ laid a more deeply tinted egg 

 than the jPj $ $ ex Brown Leghorn $ . 



The F2 generation ex Langshan ? x Hamburgh cT forms an 

 interesting commentary on the Leghorn -Langshan results. Eggs laid 

 by Fi pullets were tinted, belonging to about grades 6 — 7 (cf. PI. IX. 

 fig. 6). The distribution of egg-colour among the 51 F2 pullets'^ is 

 shown in Fig. 3. There is a complete range from the white of the 



I 



t 



1 23 45 6 789 10 11 



Fig. 3. Distribution of grades of egg-colour in F2 generation 

 ex Langshan $ x Hamburgh ^ . 



Hamburgh up to the deep colour of the Langshan. The curve is evidently 

 bimodal, and can readily be separated into two portions — a smaller one 

 in which the colours range from 1 — 5, and a larger in which the range 



^ Eaised from 2 Fi ? ? and 1 Fid . 

 - Raised from 2 i^i <r <? and 3 Fj ? ? . 

 Joum. of Gen. x 20 



