Toyaina, On certain characteristics of the Silk-worm etc. 



When we crossed those variants above described with normal- 

 egged breeds, the results were nearly the same except the production 

 of pure normal form in F 2 . 



Such phenomena of inheritance might be mistaken as non- 

 Mendelian, since both characteristics produce antagonistic charact- 

 eristics and seem to be neither dominant nor recessive. 



Are they really non-Mendelian? 



Let us consider the results of the other series of our experi- 

 ments and our opinions deduced from them. 



Series IV. 



Reciprocal crosses between certain breeds which have special 

 colour characteristics of the egg. 



1. Chinese "Joken" and Japanese "Aobiki". 



The former has a special greenish characteristic and certain 

 other characteristics such as lustre and shade, which are quite 

 wanting in the latter breed. 



In this cross, Chinese females mated with Japanese males gave 

 all Chinese characterized eggs, on the contrary, the reversed matings 

 all Japanese coloured eggs. This cross was repeated with various 

 breeds, the result being always the same. 



2. Japanese green and normal white. 



The former have a greenish shade while the latter have not. 

 The shell is also more or less tinted with green in the former, 

 some shells very slightly; while the shell of the latter is quite 

 devoid of any greenish tint. 



The results of reciprocal crosses are the same as in the former 

 cross, that is to say, green females mated with normal males gave 

 eggs which are entirely the same as those of pure green breeds. 

 The contrary is the case when normal females are used. 



3. A light brown-egged breed and a normal-egged breed. The 

 results are entirely the same, the phenomena of inheritance are 

 quite maternal, no paternal influence was observed. 



4. Theophila mandarina X Bombyx mori. 



In this case, the same holds good in any mating. 



5. Papillons noirs X Tetravoltine white. 



This is another example of matroclinous inheritance. 



In those cases above mentioned, even the eye of experienced 

 breeders could not distinguish the pure-bred eggs from cross-bred 

 ones. 



6. In the case of albinos, the phenomena are a little different 

 from those described above. 



In our experiments, we made use of three kinds of albinos, 

 one derived from a Japanese normal univoltine white called "Chusu" 



