2Q6 THE BOTANICAL MAGAZINE. LVoi. xxxn. No. 382. 



variety was fertilized with the pollen of whitish yellow grained 

 one, the resultant grains were all blue. Similar blueish grains were 

 collected, however, on the ear of whitish yellow grained variety, which 

 was the result of the fertilization with the pollen of blue grained one. 

 These results are quite coincident with other cases of xenia observed in 

 the maize, rice, millet and so on, especially some characteristics of the 

 first named plant are almost similar in their inheritance as well as in 

 their nature. 



The mosaic F x ears resulting from the cross, "Sekitori " x "Golden- 

 melon," was attributed by Miyazawa to the occurrence of vegetative 

 segregation of the gene, and he calculated the ratio of both grains, blue 

 and whitish yellow in almost one to one. And from these blue grains 

 he obtained almost the same number of two sorts of plants, the one 

 having only blue grained ears, and the other having mixed, mosaic 

 ears. And from these whitish yellow grains as he classified them, he 

 raised two sorts of plants, the one bearing only whitish yellow grains 

 on the ears and the other having mixed grains as in Fi plants, almost in 

 an equal proportion. Of these results, the last case is most curious 

 and misleading. In the writers' counting, the ratio obtained was 

 almost three to one instead of one to one, as to which the actual 

 number will be given below. 



According to Miyazawa, the grain color can be distinguished easily 

 from the other at a stage, a little before ripening of the ear, without 

 rubbing off the shell. In the writers' samples, the distinction was made 

 without difficulty in some crosses, but in other crosses it was hardly 

 possible to see it unless the shell was rubbed off. 



The writers examined about ten thousand grains upon the ears 

 of Fi plants resulting from several crosses. The results thus obtained 

 are tabulated and summarized as follows : 



Experiment I. 



fBlue grained "Sekitori " 



Parents : < 



iWhitish yellow grained " Shiro-mug 



"Sekitori x " Shiro-mugi " 



