154 On the Inheritance of Colour in Pigeons 



with no white type. Silver may have been carried by </* 9, but being 

 recessive to Blue would not appear in this cross. 



TABLE V. 



Extracted blues and silvers respectively mated together, and also mated 

 to typical C. livia and to white. 



Offspring 



— 1 



Exp. 71. Silver, no white $ 22 x Typical blue C. livia </ 27. 



In this small experiment an extracted silver was mated to one of 

 the Irish C. livias sent me by Mr J. L. Bonhote. Only two young 

 were raised, both being typical blue rocks with white rumps. 



Exp. 72. Blue, no white $ (no number) x Typical blue G. livia </• 

 (no number). 



This mating was made by Mr Bonhote. The blue, no white $ was 

 raised by him from the two birds mated together in Exp. 70. The 

 typical (^ was one of his Irish Rock pigeons. Two young were raised, 

 one being a typical G. livia in all respects, the other however had two 

 blue feathers on the white rump. Although, as has been seen, the 

 white-ru raped form is dominant to the blue-rumped form, this dominance 

 is not always quite complete. 



Exp. 73. Silver, no white $ 22 x White c/* 10. 

 This experiment, in which an extracted silver is mated to a white, 

 is a contrast to Exps. 56, 57, and 58, from the fact that the white 

 ^ used, bred from two unchequered birds in Exp. 55, is devoid of the 

 chequer character. The two young produced were blue with several 

 white feathers. A very critical examination showed slight darkening 

 near the shafts of twelve wing coverts in one bird and nine in the other, 

 but apart from this there was no trace of chequering. 



^ One of these birds had two blue feathers on a white rump. 



f 



