R. J. D. GRAHAM 



213 



The accompanying diagram shows the relationships between the line 

 cultures of each year. It will be noticed that there are numerous natural 

 crosses. These numbers have been enclosed in brackets. The figures below 

 each letter give the number of plants of the colour occurring in the line. 



Glume characters. The varieties of juar can be divided into two main 

 groups as regards the length of the glumes in comparison with the size of the 

 grain. The commoner type has the glumes shorter than the grain which is 

 thus exposed and appears to be held in a cup formed by the glumes ; the less 

 common type has the glumes much longer than the grain. The glumes meet 

 above and conceal the grain. The long glume character is, so far as 

 observation goes, always associated with a loose type of panicle. 



Cross X. 



The first cross between the long glumed juar and the short was noticed 

 m 1911 when in a pure line of Galgalya six short glumed heads were observed. 

 These on further culture split into long and short in a ratio which corresjjonds 

 very closely with the Mendelian ratio, 3:1. 



Table X. 

 Galgalya {long glume). 



