146 ON VISIBLE AND INVISIBLE CHARACTERS IN SILKWORMS. 



of the visible colour character, show great complications. The 

 imivoltine layings which appeared in the generations after F 1 in 

 the multivoltine Nistri 9 an d univoltine Ital.-Jap. <3 cross, and 

 the multivoltine layings which appeared in the reciprocal cross, 

 show that the maternal parents are dominant in the univoltine 

 and multivoltine character respectively, and that these characters 

 were inherited from the paternal grand-parents in which they ivere 

 dominant characters. So these recessive characters in males 

 appear to become dominant when inherited by the females. 

 Either the female sex is in some way closely associated with the 

 dominance of the multivoltine and univoltine characters, or there 

 is some factor present in the male which makes the univoltine and 

 multivoltine characters lie latent, but does not hinder them from 

 being handed down to the offspring, the females of which may show , 

 in a dominant form, the latent character of their paternal parent. 

 The inheritance of the invisible univoltine and multivoltine 

 character does not appear to be quite Mendelian ; however, it 

 may be that the sex-limited descent affects the inheritance, and 

 there is really no failure in the segregation of the unit characters 



Bibliography. 



Bulletin of the College of Agriculture. — Tokyo Imperial Univer- 

 sity, Japan, 1906, Vol. VII. "Studies on the Hybriclology of 

 Insects "' : K. Toya ma. 



" Sulla Riproduzione degli Incroci e su alcimi caratteri ereditari 

 che presenta la Sericaria Mori in relazione alle leggi di Mendel " :. 

 E. Qua j at. 



" Mendel's Principles of Heredity " : W. Eateson. 



" Breeding and the Mendelian Discovery " : A. I). Darbishire. 



