K. ToYAMA 369 



Mixture of 



Japaneae nonnal Tariona 



colour- batches shaded eggs Totals 



2 8 5 



1 



8 5 22 



2 18 



2 5 



Totals 13 12 11 36 



Of 36 batches or matings obtained, 13 were greenish slate as in 

 their parents, 12 Japanese normal colour, the rest being a mixture 

 of both kinds of eggs and some intermediate ones in various pro- 

 portions. 



Owing to certain variations found in a batch, or between various 

 batches, and the scanty number of matings obtained from each parent, 

 we are unable to give the exact numerical proportions of these various 

 coloured batches, but we certainly see that the uniform coloured 

 F-i characteristic disintegrated into various coloured forms. 



In the spring of 1906, we reared worms derived from normal- 

 coloured eggs. Moths paired inter se gave all divoltine white eggs. 

 The fourth generation from these divoltine white eggs were reared in 

 the summer of 1906. Three matings gave three kinds of egg batches, 

 as in the former generations, namely : 



In 1907, we made similar experiments. The worms which came out 

 from normal-coloured batches gave all divoltine white eggs in the 

 spring. The summer broods gave 30 batches of eggs, all of them being 

 of the normal Japanese colour. Since then they liave bred true to 

 parents, never giving any greenish coloured ones. 



Resume : 



T = greenish-slate coloured batches like those laid by pure Theophila. 



N= brownish-slate coloured egg batches, common to normal Japanese breeds. 



if = mixture of those two kinds of eggs above-mentioned and some intermediate 



coloured eggs. 

 JF= divoltine white. 



(1) (2) 



( ? Theophila x d Bombyx) ( ? Bombyx x <f Theophila) 



i-'i eggs T N 



F-i eggs T T 



