K. TOYAMA 



367 



To avoid complication, we give below a graphical summary : 



B = brown egg batch; ^ = normal-coloured ; ir=divoltLne white; M=mixture 

 of brown and normal-coloured eggs in a batch. 

 Common parent ... N 



I 



Parent egg 



First generation inbred 



I 



I 



W (87) 

 I 



I 

 N) 



I 

 W{T2) 



1 I 



Second generation inbred B (30) -I- iV(lO) + i/(36) 



Third „ „ IK (67) 



Fourth 



Fifth 



Sixth 



I I 



i'(lO) + N(15) + M{18) 



I I 



5(14) -f N{2S) + il/(16) 



B(64) 

 IF (44) 

 B (572) 



i 1 



N {G) + B(1) + WHS) 



I I 



N (6) -I- W (33) 



I 



I I 



N (25) + W (4) 



From the results above obtained, we observe that complete segrega- 

 tion between the two characteristics, the brown and the normal-coloured, 

 took place and that each may be established as a constant form from 

 their common stock. It is much easier, however, to establish the brown 

 as a constant form than the normal. 



Moreover, we learn that during two or three generations both 

 characteristics even when inbred produce antagonistic characteristics 

 in their offspring, a fact which apparently seems to run counter to 

 Mendelian principles, but which in reality is in perfect accordance with 

 the principles, as will be seen in " General considerations." 



Series 2. The Blue-egged Variant (Fig. 5). 



The phenomena of inheritance, similar to those above described, 

 were observed in the inbreeding of the blue variant. This form is 

 a sport from a divoltine normal-egged breed called " Kuni-nishiki," and 

 is characterized by the special blue colour of the egg. 



In the spring of 1910, only one batch (No. 20) was obtained, through 

 the kindness of Mr S. Saito in Ghifu-Ken. The worms, cocoons, and 



