YOSHIMARO TAN AK A 24 1 
4) The presence of Q, factor favours pigment formation in the epidermis, 
whereas the presence of P has opposite effect and lead to partial suppression 
of pigment development. So that pQ, animal is more intensely pigmented than 
PQ,, and PQ, than pq, and pq than Pq ; L pattern is likewise more fully develop- 
ed in pQ,L and PQL than in pqL, and pqL than in PqL. The development of 
Z pattern is, on the contrary, scarcely affected by the presence of P or Q. 
5) The striped character is dominant to the moricaud, but in certain 
parts of the body, the moricaud or recessive pattern is apparently developed 
in the striped hybrid. Similarly the quail factor is partially dominant and 
partially recessive to the plain. These facts show that the relation of 
dominance and recessiveness is more complex than is generally supposed. 
6) Bringing forth individuals homozygous for the presence of both S 
and M is impossible in consequence of complete repulsion occurring between 
them. This case might be taken as an example of multiple allelomorphism. 
7) Coupling and repulsion take place between the yellow (cocoon or 
haemolymph colour) and either one of the following markings : 
1) Quail, 
2) Normal, 
3) Striped, 
4) Striped-quail, 
5) Moricaud, 
6) Moricaud-quail. 
It is not impossible to imagine that all these cases of coupling and 
repulsion are nothing other than the correlation of Q and Y, because the Q 
factor is common to all of these markings. 
8) Coupling and repulsion in the silkworm are peculiar in being com- 
plete in the female, but partial in the male : this phenomenon may be called 
"dimorphism of gametic series." In connection with this subject, more 
than 101,000 larvae have been raised in the last four years. 
9) Partial coupling and repulsion in the male are comparatively low in 
intensity; the ratios are usually approximate respectively to 3 : 1 : 1 : 3 and 
