8 ruLLINATiON AM) CROSS-FERTILISATION IN RICE. 



As in the case of K 20 described above, here again it was 

 too late to determine accurately the stigma colour in types (1) 

 and (2), the only obvious point of diti'erence between them, when 

 the plot was examined, except in the cases noted. 



Ill the second (labelled D 6), the parent plant had a red 

 grain and in 1912 split into four main types, two with red and 

 two with wliite grains, as noted below. 



D e-Red-Krained, 1911. 



(1) Reddish leaf sheatha and 

 stem above nodes, grain 

 white . 14. 



(•_') Ditto, grain 

 •itnber 1. 



(.3) Green leaf- 

 sheaths and 

 stems, grain 

 red of vari- 

 ous shades 



(4) Ditto, grain 

 white ... 26. 



43 



In the third (labelled D 7), the parent was red-grained, and 

 split into three main types, two with red grains and one with 

 white, in tliL" proportions given — 



1. Glumes yellow, grain red 



2. Glumes mottled brown, grain red ... 



3. Glumes mottled brown, grain white 



... 50 

 ... 34 

 ... 13 



The remaining four Dinajpur examples are similar to those 

 ot M 1 and B 15 described above, viz., red-grained parent plants 

 splitting into red and white-grained offspring, almost indistin- 

 guishable except for the colour of the grain. The details of 

 these four cases are as follows : — 



From a perusal of the above figures, together with those of 

 M 1 and B 1.5 rjuoted above, it would seem that as regards 

 colour of grain segregation is taking place in the simple Men- 

 delian ratio of li : I.* Cross-fertilisation experiments are in 



• Cf. Van der Stok, 1. c, \t. 4'.t. 



