YOSHIMARO TANAKA 
A io6'i5 A 288'i5 
23J 
/ 1 i 1 
3-111. 4-111. 3-ni- 4-m. 
135 M7 2 4 394 
I I 
( 1 
A 333'i5 3-m. 4-m- 
4 1 377 
A 250'! 5 A i46'i5 
All 4-111. 3-m. 4-m. 
103 19 360 
I I 
? x Z 
t 1 
A 38 1 ' 1 5 3-m. 4-m. 
35 392 
There is some indication of positive correlation between the male sex 
and 3-moulting variants. Of the 58 3-moulters in A 202 r i5 only 14 were 
allowed to complete their development, and of these 13 were male, and 1 
female ; of 24 3-moulters in A 288' 1 5, 7 emerged as moths and were all males; 
the 41 3-moulters in A 333' 1 5 consisted of 30 males and 1 1 females;, of the 
74 sports of A383'i 5 26 individuals completed their development and all were 
males °. 
Apart from the sporting, the moulting character seems to do not always 
behave in inheritance so simply as in the examples given at the beginning of 
the present section. In the course of my experiments, pretty complex ex- 
amples have very frequently been met with, the more important of which are 
cited here. 
1) Heterozygous 3-moulters yielded by inbreeding, 3- and 4-moulters 
in ratios approximate to 1 : 1 instead of the ordinary 3 : 1. 
2) Heterozygous 3-moulters produced, when crossed with recessive 4- 
moulters, various abnormal ratios ; in some cases the recessives fell far behind 
1) In ordinary cases the sex-ratio in the silkworm is more or less approximate to IOo : IOO. 
