R. J. D. GRAHAM 



205 



{A. dorsata) and another small bee with yellow stripes (A. indica ?). The bees 

 worked carefully over the panicles, picking out the recently opened flo^^ers 

 from whose anthers they milked the pollen with their first pair of legs. By 

 8 A.M.. the visits of the bees had ceased. Undoubtedly the bees are an 

 important agency in bringing about pollination by foreign pollen. 



Frequency op Foreign Pollination. 



Foreign pollination is much more common in some varieties than in 

 others and observations show that it is less frequent in the compact types 

 of inflorescence and more frequent in the looser types. Amongst the latter 

 foreign pollination is more common in the types with short glumes than in those 

 with long glumes. These observations are in accordance with expectation, 

 the flowers in the compact type of inflorescence being close together and as 

 pointed out above the anthers, in some cases, never falling out of the glumes, 

 while in the flowers with long glumes these furnish a certain amount of 

 protection. 



Taking as a basis for comparison the occurrence of foreign pollination in 

 the single plant cultures the following table shows the relative frequency :— 



Table III. 



The highest number of crossed flowers was found in Tharthur which 

 showed 165 in 18 lines or 817 crossed flowers per 100 heads. 



The percentage of crossing obtained by counting a given number of plants 

 and noting those which were untrue to type is 6% or 97 plants out of 1,577 in 

 a loose type of panicle with short glumes, and only '6% or 2 plants out of 292 



