R. Staples-Browne 153 



be noticed, on reference to my previous paper (P. Z. S. 1908, p. 70), 

 that similar birds appeared in the Barb-Fantail crosses, and it was 

 suggested that this character had been introduced by the Fantails 

 used. If this explanation is a correct one it holds equally good for 

 this case, as the Fantails used in these crosses were related to those 

 used in the Barb-Fantail matings. 



Exp. 67. Silver chequer, no white $ 31 x Blue chequer, few w. f. 

 c/" 10. 



The silver chequer $ , raised in Exp. 59, is the same bird that was 

 used in Exps. 61 and 02, giving all silvers when mated to silver, and 

 blues when mated to white. The blue chequer J' was raised in Exp. 63, 

 from the mating of a white heterozygous in the blue character with 

 a silver chequer. This bird had a few white feathers on the rump, 

 vent and thighs, and also three white flights. From this mating 10 young 

 were raised, all chequered, showing that one of the parents is homo- 

 zygous in this character. This must obviously be the blue j/, as the 

 silver $ has produced in Exp. 61 non-chequered birds. The young 

 produced were 8 blue chequers and 2 silver chequers. Two of the blue 

 chequers and one of the silver chequers had no white feathers. Five 

 blue chequers were classed as having very few white feathers, and the 

 other one had several white feathers. The remaining silver chequer 

 had only a very few white feathers. 



Exp. 68. Silver chequer, some w. fs. $ 11 x Silver, no white </ 28. 



This experiment shows the dominance of the chequer character, 

 the chequer ^ being obviously homozygous in this character. Eight 

 young were produced, all being silver chequers. Of these six had no 

 white feathers, whilst two had a very few white feathers on the vent and 

 thighs. 



Series E. {v. Table V.) 



Exp. 69. Silver, no white $ 43 x Silver, no white J' 28. 



This mating was made to test the recessive silvers. Seven young 

 were produced, all being silver with no white. The character, therefore, 

 breeds true. 



Exp. 70. Blue, no white $ 31 x Blue, no white ^^ 9. 



A similar experiment to test the extracted blues with no white 

 feathers. These birds, mated in my aviaries, produced six young, and 

 were afterwards sent to Mr J. L. Bonhote and produced five more, making 

 a total of 11 birds. All these were true to the G. intermedia, or blue 



11—2 



