110 
Y. TANAKA. 
jl 
1 ZmlYZmIY 
1 2 ZmlYzmiY 
' 9 zebra' white 
2 ZmlYZmiYj 
4 ZmIYzmiY| 
77 
69.9 
1 zmi Yzmi Y | 1 plain yellow 
11 
7.8 
1 zmlYzmIY 
2 zmlYzmiY 
3 plain white 
23 
23.3 
j Total 
497 
497.1 
In the foregoing Tables we see that the theoretical expectation on my 
assumed gametic and zygotic formulae iu each series, is in close accordance 
with the experimental figures obtained by CoUTAGNE. The most complicated 
cases, LX and LY, in his experiments are, as I believe, also clearly 
analysed. A few irregularities which we find in Tables V and VI are, as 
I already pointed out, evidently due to some accidental causes. 
Summary. 
1. Hitherto no theoretical studies except those of Toyama, have been 
made public on inheritance in the silkworm. 
2 . Toyama’s factors which appear to have been assumed after Mendel’s 
original view are sometimes difficult to be applied to the interpretation of 
the more complicated cases of Mendelian inheritance. 
3 . The conception of the Mendelian genes assumed on the basis of the 
presence and absence hypothesis enables us to explain more simply and 
adequately all the experimental results obtained by previous investigators as 
well as those of the present author. 
4 . Our postulated factors or genes for the larval markings and cocoon 
colours, as far as yet experimentally confirmed are as follows: 
