(>H'2 Toyama, On certain characteristics of the Wlk-worm etc. 



Each batch laid by a mating was reared separately, but both 

 the brown and normal colour-characters produced the antagonistic 

 characteristics for certain generations, and at last both became a 

 constant form. 



Series II. 



The Wliitisli Grey Egg. 



This is also a variant derived from the divoltine normal-egged 

 race called "Chusu". This is characterized by the special structure 

 of the shell. In the ordinary breed, it is elastic and translucent 

 and the surface is smooth. That of the variant, on the contrary, 

 is thick and rather brittle, with the surface irregularly corrugated. 

 It is opaque, and the colour of the serosa can hardly be seen 

 through the shell in consequence of which a peculiar whitish colour 

 is produced. There is no depression in the middle. 



In the spring of 1909, we reared two batches of the variant. 

 They, paired inter se, gave the following result, which is nearly 

 similar to that given in the preceding table. 



F! G 



F 2 (X + G) 



F 3 N+(N + G) (N + G) 



F 4 all N (N -f G + BG) 



F 5 all N (G + BG) (N + G -f- BG) 



F 6 ""alllr '(G + BG)/ 



G = Greyish white; N = Normals; Gb = a new form. 



Series III. 

 The spindle-shaped egg. 



This is also a variant derived from the univoltine Japanese 

 white, which usually lays oval eggs. The egg is a long spindle- 

 shaped one and is slightly pointed at both ends. There is no 

 depression in the middle, which is a characteristic common to 

 ordinary silk-worm eggs. 



The first generation, was reared in the spring of 1909. They 

 gave all normal-shaped eggs without any exception. The second 

 generation derived from the normal eggs gave two sorts of batches, 

 33 being normal and 13 spindle-shaped batches. 



Both of them again produced the antagonistic characteristic in 

 the next generation. Thus 



F! Sp (1) 



F. N 



F, 



F 4 CN+Sp) (N + Sp). 



Sp = spindle-shaped; N = normal. 



