MEN DELIAN FACTORS IN THE SILKWORM. 
Ill 
n, 
Absence of stripedness; plain. 
” ” zebra-pattern ; plain. 
” ” moricaudness ; plain. 
” ” normalness; plain. 
For larval markings. 
S, Striped black. 
Z, Zebra-pattern. 
M, Moricaud. 
N, Normal or common 
pattern. 
For cocoon colours. 
Y, Yellow. 
I, Inhibitor, which pre- 
vents the development 
of yellow color. 
5. Normal marking is hypostatic to the striped, zebra and moricaud. 
6, In my experiments I had no such matings as would have been suggest- 
ive for the determination of inter-relations of the genes S, Z and M. But 
the results obtained by previous observers appear to indicate, as far as they 
go, that these characters are almost equipotent with each other in their 
dominancy. 
y, Absence of yellowness ; white, 
i, ” ” inhibitor. 
March 1913. 
