K. ToYAMA 355 



2. Eggs laid by the Summer Broods of the Normal Series 



Number Normal Brown Mixed 



of Matinga Batches Batches Batcbe* ToUls 



No. 18. 12 4 4 4 12 



„ 14 2 5 12 19 



„ 9 1 1 2 4 



No. 4. 1 3 3 



TotalTT^ 10 ~lo 18 38 



In the former or brown series, 10 were normal, 30 brown and 7 

 a mixture of both normal and brown eggs in the same batch, and 

 therefore in this series the normal colour-characteristics remained as 

 recessive. The reverse is the case in the normal series, which produced 

 10 normals, 10 browns and 18 mixtures, that is to say, the brown is 

 recessive in this series. 



The Third Generation of Normal Series. 



In the autumn of 1908, three normal-coloured batches derived from 

 summer broods of the normal series were reared. They gave 58 batches, 

 among which there were 28 normals, 14 browns and 16 mixed batches, 

 that is to say, they again produced the antagonistic character. 



The third generation of the brown series or brown batches laid 

 by the summer brood in 1908 were reared in the spring of 1909. They 

 gave, as is usual, all divoltiue whitish eggs. 



The Fourth and Further Generations. 



The fourth generation of the normal series derived from normal 

 eggs laid by the normal series in the autumn of 1908 gave divoltine 

 white eggs, a few being univoltine normals and browns. The same is 

 the case in the fifth generation which was reared in the spring of 1910. 

 In the spring of 1911, i.e. in the sixth generation, we noticed for the 

 first time that this series of normal characteristic inbreeding gave all 

 normal batches with a few divoltine white batches, which may be 

 considered to be normal coloured in character, that is to say, they breed 

 true to parents. 



On the contrary, the fourth generation of the brown series or 

 summer brood of 1909 yielded, without exception, brown eggs. Since 

 then we have reared them through two generations without producing 

 any antagonistic characteristic. Hence it may be said that this brown 

 form is established as a constant form. 



Respective figures obtained by this series of experiments are given 

 in Table I. 



