358 1B, do ANIDIL DINE. 
who found that the blue bird was really a hybrid between the black and 
the splashed white. Both the blacks and the splashed whites are pure 
strains ; blacks bred together give all blacks, whites bred together give all 
whites. When black is bred with white the birds obtained are all blue. The 
AFTER FIRST CROSS, 
EACH MATED WITH 
HIS OWN COLOUR 
| ee 
LS Be poles it 
YYEYD VED © 
eraee BLUE ANDALUSIAN FOWL NET 
THE BLUE BIRD 1S A HYBRID BETWEEN BLACK AND SPLASHED WHITE 
BLACK BY BLACK CIVES ALL BLACKS, WHITE BY WHITE ALL WHITES. 
DIAGRAM 2. 
blue birds bred together give blacks, blues and splashed whites in the pro- 
portions of one black, two blues, one splashed white. 
When the blues of this second generation are bred together they give 
offspring in the same proportions: one black, two blues, one splashed 
white. 
The diagram showing these relations should be compared with that 
representing the yellow and green peas. It will be seen that the scheme 
of inheritance is really exactly the same in the two cases, the apparent 
difference being due to the fact that whereas the hybrid pea takes on the 
character of the dominant yellow parent, the hybrid Andalusian has an 
appearance intermediate between the two parents. 
That the yellow hybrid pea has a different constitution from its yellow 
parent, although its appearance is the same, is shown when hybrid plants 
are self-fertilised or bred together. As we have seen, the offspring are 
one pure yellow, two hybrid yellow, and one pure green. A further 
means of testing the hybrid character of this yellow pea is to fertilise the 
plant grown from it with pollen from a pure recessive plant grown from a 
green pea. Hybrid yellow crossed with green gives green and yellow peas 
in equal numbers. 
Similarly a blue Andalusian mated with a splashed white gives blue 
hybrids and splashed whites in equal numbers, or a blue crossed with a 
black gives blues and blacks in equal numbers. 
What I have described so far are the experimental facts, which have 
been repeatedly confirmed on these and many other plants and animals, 
