14 THE GLORY OF THE GARDEN 



spending number of whites, more or less tinged with 

 magenta, which evidently exhibit the two gametic 

 elements that must be combined in one zygote in 

 order to produce the lavender. In this case, the 

 bright magenta reds immediately breed true when 

 self-fertilised. 



There is another colour in Primula sine?ists 

 which apparently cannot exist in a pure form. 

 This is a peculiar shade of " crushed strawberry," 

 and the two pure forms by the union of which it is 

 formed are the deep crimson of " Crimson King " 

 and the white with a bright pink eye, brought out 

 by Buttons under the name of " Duchess." By 

 crossing these two together, the peculiar hetero- 

 zygous colour can at once be produced. 



One of the most striking instances of hybrid 

 characters in the animal world may be seen in the 

 case of the Andalusian fowl. The blue Andalusian 

 fowl owes its popularity with the public, and its 

 interest to the student of heredity, to its colour, 

 which is a slaty blue-grey. 



If two birds of this strain are mated, it will be 

 found that they do not breed true. In every four 

 birds on the average, three types of colour are 

 produced: two blue, one black, and one white. The 

 blacks are found to breed true to their colour and 

 so are the whites, and the blue Andalusians, when 

 mated together, again produce these three types 

 in the same proportions. 



From this it would seem pretty obvious that the 

 blue Andalusian is a hybrid, and as such can never 

 be fixed. But cross one of these black birds with a 

 white and the result is a blue Andalusian, and blue 

 birds obtained in this way produce a generation of 



