258 



Toyama. 

 Table III. 



Ten matings yielded, without exception, all yellow Fi offspring, 

 that is to say, Japanese whites are hypostatic to European yellows 

 which behaved as hypostatic towards European whites, as is already 

 shown in Table II, and consequently we may say that in spite of 

 the same white colour, the nature of Japanese whites is not the 

 same as that of European, since the former are recessive and the 

 latter dominant towards the same yellow. 



Moreover we learn that those extracted yellows from Italian 

 white and "Sina Blanc" are homozygous from their first appearance, 

 since they did not segregate when mated with recessive whites. 



II, European white x Japanese yellow. 



Next let us see the results of mating between Japanese tetra- 

 voltine yellow (Onodahinie) and Italian white. The yellow used in 

 this experiment were reared in our University's silk-worm nursery 

 during many generations and was proved to be homozygous in the 

 colour-characteristic. The white is, on the contrary, derived from 

 Italian white No. 11 which paired inter se produced mixed offspring 

 consisting of white and yellow in an approximate proportion of 3 

 whites: i yellow, as is shown in Table II. Thirteen matings gave 

 the following offspring. 



