tARNELL, RANGASWAMI AYYANC^iR AND RAAltAH 9? 



The results so far obtained show the following types of repulsion : — 



L G repels S A 

 Li Ct ,, o 



G „ S 



L „ S 



Altogether over G0,000 plants have been examined with respect to the 

 above typos of repulsion and no example of incomplete repulsion has been 

 recorded. It follows that the repulsion is at the least of an extremely high 

 degree. 



With regard to the coupling of purple stigma and purple axil the families 

 showing segregation for both factors include about 34,000 plants but no failure 

 of this couphng has been noted. This indicates that it is either complete or 

 of a very high degree. 



In this connexion it may be noted that purple stigma and axil are very 

 commonly found associated with a purple tip to the inner glumes. This is a 

 very well marked character (Plate IV, B, 23) quite distinct from the purple 

 glumes already described. The above three characters are characteristic 

 of a large number of varieties and there is evidence that they are also present 

 in certain unpigniei\ted varieties where the lack of a pigmentation factor 

 prevents their appearance. 



It is highly probable that tlie purple tip is coupled with the other two 

 but no undoubted case has been noted. In the preseiice of purple glumes the 

 tip cannot be determined ; thus the cross B, IxB, 23 may have been either 

 pure or imjnire for this factor. In the resulting families all plants with green 

 internode and glumes possessed purple tips, showing that, if it was imijure 

 in the cross, this factor also was conceri\ed in the reduplication already 

 described. 



It was at first thought that purple tip and stigma might be due to a single 

 factor, since they invariably occurred together, but a few rare cases have now 

 been found of purple tip associated \Nith white stigma and vice versa, 



(/) Ripening black character of inner glumes. 



In this character a black pigment appears in the inner glumes at tlie time 

 when the fully developed grain begins to ripen. In one or two days the glumes 

 become almost entirely black, with a slight brownish tinge, and the colour 

 then fades considerably so that the grain, when dead ripe, has a dull smoky 



