1908.] INHERITANCE OF COLOUR IN PIGEONS. 83 



replaced by blue chequered with black. In these cases indication 

 of black wing-bars were seen. The amount of white varied, but 

 was in excess of the amount present in the F. 3 blues with white 

 feathers. The birds were distinctly mottled, and in some cases 

 the amount of Avhite was in excess of the blue. It appeared on 

 the head and neck, the rump, abdomen, vent, and thighs — most 

 of the flight- feathers were white and several of the tail-feathers 

 and under tail-coverts. 



Exp. 16.— F. 2 Blue with few white feathers $ 51 x White 

 Fantail S 2. 



The 5 was raised in Exp, 3. The result of the mating was 

 4 whites and 2 blues with white feathers. Of these one (JSTo. 13) 

 had white on the head, rump, vent, and thighs, 6 white flight- 

 feathers and some other wing-feathers. The other (No. 36) had 

 white on the head, throat, rump, vent, and under tail-coverts, 

 16 white flights and some other ^ving- feathers, and 5 white tail- 

 feathers. These two birds were mated together in Exp. 26. 



Exp. 17.— -White Fantail $ 40 x F. 3 Blue w, f. ^ 30. 



Exp. 18.— F, 3 Blue w. f. $ 14 x White Fantail ^ 44. 



The two blues with white feathers were raised in Exp. 9. 

 Fifiteen young were produced from these two experiments, of 

 which eleven were white and four blue with white feathers. The 

 amount and distribution of white corresponded roughly to the 

 description given of similar bii^ds in Exps. 14 and 15. 



Exp. 19.— F. 4 Blue w. f. $ 15 x F. 3 Extracted white c? 50, 

 Exp. 20. F. 4 Blue w, f. 2 9 X F. 3 as above S 50. 

 5 15 was raised in Exp. 11. $ 9 in Exp. 10. The same cJ 50 

 was used in the two experiments. This bird was bred from an 

 F. 2 Red and a white Fantail, which mating is not described in 

 the present paper. The result of the two experiments was 4 

 whites and 2 blues with white feathers. These birds were similar 

 to those bred in Exps. 14, 15, 17, and 18. 



Exp, 21.— Extracted white $ 20 x F, 3 Blue w. f, c^ 13, 

 Exp, 22.— Repetition of Exp. 19. 

 Exp. 23.— F. 4 Blue w, f, $ 9 x White Fantail S 34. 

 The white $ 20 was raised in Exp. 31 from a blue and a black, 

 both containing white. F. 3 cf 13 was raised in Exp. 9 and is the 

 same bird that is used in Exp. 11. F. 4 § 9 is the same bird as 

 used in Exp. 20. These three pairs were jDut \\p to test further 

 the proportion of blues with white feathers to whites. The young 

 birds were killed as soon as they had feathered sufficiently for 

 their colour to be seen. No details were kept. The blue with 

 some white feathers in Exp. 22 died in the sheU a day or two 

 before it would have hatched. No hesitation, however, is felt in 

 recording this bird as blue since it had a black beak. It was 

 found that, although blue birds with white feathers sometimes 

 occur with white beaks, no case has been met with in which white 

 birds had black beaks. In addition to this it was noticed, as the 

 experimenter became more familiar with the appearance of young- 

 birds in the nest, that birds which were subsequently coloured 



