K. ToYAMA 365 



S= spindle-shaped eggs; iV= normal-shaped. 

 Parent eggs ... ... S 



Eggs of first generation N 



I 1 



I I 



Eggs of second generation (iV + S) 



Egg.? of third generation (N + S) (N + S) 



Although we are not yet able to establish this variant as a constant 

 form, we may infer from the above facts that it comes in the same 

 category as the variants just referred to. 



Of the various egg-characteristics discussed in the series of experi- 

 ments above referred to, we know that those in the first and second 

 series are derived from the colour of the serosa, those in the third and 

 fourth series from the shell, whose special structui-e gave the egg some 

 characteristics different from normal-shelled eggs. 



Notwithstanding their origin being different, their order of inherit- 

 ance is nearly the same. 



Let us now compare the results obtained in the third and fourth 

 series, which are represented as below : 



1. The Results of the Third Series. 



(G and BG are considered to be a single character G.) 



Parent eggs G 



I 1 



I, I 



Eggs of first generation ... {N + G) 



I I 



I ' 1 I ' 1 



I III 



second ,, ... N {N + G) (N + G) 



I 

 , I , 



I I 



third „ ... N (X + G) 



I I 



fourth N (G + N) + G 



I I 



fifth ,. ... N G 



