Summary. 



Andropogon Sorghum, Brot. is protogynous. Normally the flowers are 

 pollinated from the higher flowers of the same panicle. The flowers though 

 t}T3ically anemophiloiis are regularly visited at certain seasons by insects, 

 chiefly bees. This undoubtedly leads to natural cross-pollination, the liability 

 to which depends on the structure of the panicle, being greater in the laxer 

 forms. 



Flowering takes place in a fairly regidar order. During the months over 

 which the observations extended, the majority of the flowers opened between 

 2 and 4 a.m. Stray flowers may open before or after, this being influenced 

 by the moisture conditions of the air. 



In the grain the red colour and the yellow colour behave as simple 

 allellomorphs, as also do the red colour and the white colour, red being in both 

 cases dominant. Likewise the yellow colour and the white colour may behave as 

 simple allellomorphs, or the heterozygote may be red, behaving as a dihybrid 

 with a 9 : 3 : 4 ratio for red, yellow and* white, respectively. The simplest 

 explanation is that certain white grained plants are undeveloped reds requiring 

 the presence of yellow to cause the red colour to develop. 



In the glumes the long character and the short character behave as simple 

 allellomorphs. 



Nagpur, 

 October 1915. 



