130 Glume-Length and Grain- Length in Wheat 



(8) A development of hairs, far more marked than that exhibited 

 by either parent variety, is found in certain of the F2 plants. These 

 plants are all of short glume type. Length of glume appears in some 

 manner to inhibit the full development of hairs. 



(9) The Inheritance of Hollow and Solid Straw is complicated and 

 a relationship may possibly exist between " shift " in glume-length and 

 nature of straw inheritance. 



(10) The investigation is to be continued by growing on the pure 

 Fo types as well as the "shifted" parental forms from the ^3. By 

 crossing the " shifted " and F^ types it is hoped to test the behaviour of 

 " shifted " types in inheritance. 



Table XVII (p. 131) presents diagrammatically a r^sum6 of the 

 measurable characteristics of the glume types in successive generations. 



Opportunity is taken here to thank Professor R. H. Biffen, F.R.S., 

 and Mr G. Udny Yule, M.A., C.B.E., for the help they have kindly given 

 during the investigation. 



TABLES OF FREQUENCY DISTRIBUTIONS OF GLUME- AND 



GRAIN-LENGTHS. 



Glumes, 



Table No. Type and Generation 



I Fq . P, i.e. Parent variety 



II i^g . K, i.e. Parent variety 



III F2 complete 



IV The 487 F2 plants from which seed was obtained for F3 



V 17 i^2 plants which though fertile were unripe at harvest 



VI 7 F2 plants ripe at harvest but sterile 



VII 19 F^ plants unripe at harvest and sterile 

 VIII Fi . K, i.e. Kubanka type of the F2 



IX F3 -K ex F2 . K, i.e. descendants by selfing of the plants of VIII 



X F2.P, i.e. Polish type of the F2 



XI F3. P ex F2 . P, i.e. descendants by selfing of the plants of X 



XII F2 . /, i.e. heterozygote (intermediate) plants of F2 



XIII F3 . J ex F2 . 1, i.e. heterozygous descendants of plants of XII 



XIV Complete descendants of the plants of XII (by selfing) 



XV F3. K ex F2. 1, i.e. ^tj'pe of descendants of the plants of XII 



XVI F3 . P ex F2 . I, i. e. P type of descendants of the plants of XII 



XVII Diagrammatic r6sum6 of measurable characteristics of K, I, and P io Fq, 



F2 , and Fs . 



