G. P. HECTOR 97 



27 — CEBp — Green leaf-sheath, apiculus, stigma white. 



27— cRPB— 



27 — rCPB — ,, jj ,i 



9— pbCR— 



9— rbPC— 



9— rpBC— „ „ „ 



9— cbRP— 



9— crPB— 



9— pcBR— „ „ 



3— rpbC— „ 



3 — cpbR — ,, „ ,, 



o — rcDi — J, ,f 5) 



3 — crpB — „ „ „ 



1 — rcpb — „ „ ,, 



Assuming the previous explanation, in this case, as well as dominant white 

 stigmas, there shoald also be found greens amongst the types with green leaf- 

 sheath and apiculus dominant over red coloured leaf-sheaths among coloured 

 types, and it should be possible to produce colour in the leaf-sheath by inter- 

 crossing many of the greens. Such green types are really coloured but by 

 virtue of their containing some inhibiting factor or factors which prevent 

 the appearance of the colour except when all the colour factors are present, 

 the colour is not produced, and the result is a plant with a green leaf- 

 sheath. 



Amongst the 81 plants with coloured stigmas there will be stigmas of 16 

 different constitutions, which should in the F3 produce coloured : colourless 

 in the proportions below, viz., 



1 should produce aU coloured. 



8 „ 3 coloured 



24 „ 9 



32 „ 27 „ 



16 „ 81 



1 white. 



7 „ 



37 „ 



175 „ 



Amongst the 16 differently constituted stigmis, there should be also a con- 

 siderable range of colour and it was possible without much difficulty to make 

 out 4 main classes, viz., blue-black, blue, reddish brown, and red. 



The leaf-sheath colour, on the other hand, should behave in theF3 in the 

 same way as has already been pointed out above in the case of the stigma 

 with three factors. All the coloured F2 plants from the cross C 25 ? x C9 9 

 have been sown in the present season 1915, and the following table gives the 



