90 



THE INHERITANCE OP CHARACTERS IN RICE 



most' intense in the lower half of the sheath, always extends up to the junction 

 with the lamina and often into the ligule. The lower sheaths, especially such 

 as are poorly developed, show the maximum amount of colouring. 



Plate IV shows two types which were crossed, B, 1 possessing this character 

 and B, 23 in which, although some purple colouring appeared in the sheath, 

 this definite character was absent. The purple lining of the sheath and inter- 

 node of B, 1 is due to a separate factor, to be considered later, which is in no 

 way connected with that under consideration. 



Six Fi plants were obtained from this cross, all with full-purple sheaths. 

 In F2 a simple 3 : 1 ratio was obtained for presence and absence respectively 

 of full-purple. In the latter group some individuals were practically devoid 

 of self-colour, whereas others reproduced the small amount shown by B, 23. 

 It was found that this colouring in B, 23 was almost entirely due to a separate 

 character, to be described later as furfle axil, mainly affecting the colour of 

 the inside surface of the sheath. This was absent in B, 1 ; hence the F2 was 

 segregating for this character as noted. Certain famiUes in F3 again gave the 

 3 : 1 ratio for full-purple. Table XI gives the figures obtained with regard to 

 this character only, leaving out of account other characters which do not affect 

 it in any way. 



Table XI. 

 Full-furfh self-colour of leaf-sheath. 



