B. MiYAZAWA 3 



previous paper^ I should like to repeat it here shortly. In F2 not only 

 do we find flowers of white, dark-red and magenta colour, exactly similar 

 to those of the two original parents and the ^1 plant, respectively, but 

 also we have those of scarlet colour ; and besides, in each of these colours 

 — dark-red, magenta, and scarlet — there are three gradations of tone, 

 sharply distinguishable from each other, which I will call light, medium 

 and deep, respectively. (See PI. I, figs. 1 — 9.) 



The details of the segregation of leaf- and flower-colours in F2 arc 

 shewn in Table I. 



TABLE I. 



Totals 



1184 



Here it may be remarked that in the above Table the results of two 

 reciprocal crosses as well as those of the Fo experiments repeated in 

 1917 are all summed up, because I have found no essential difference 

 among all these results. 



In Table I we see that in green plants the ratio between magenta, 



scarlet, and dark-red is nearly equal to 3 : 1 : 2, and that in yellow plants 



that between magenta and scarlet is nearly equal to 3:1, and moreover, 



it will be seen that of the three gradations of the tone of each colour 



the ratio of light : medium : deep is 2:1:1. In order to explain such 



results I have adopted the following genetic formulae for the two 



parents : 



^=ggddBBMM, 



B = GGDDbbmm. 



L.c. p. 62. 



1—2 



