THE INHERITANCE OF GLUME-LENGTH AND 

 GRAIN-LENGTH IN A WHEAT CROSS. 



By F. L. ENGLEDOW. 

 (With 1 Text-figure.) 



CONTENTS. 

 Section page 



I. The Experimental Material and the Nature of the Breeding . . . 109 



II. The Observations and the Method of Measurement ..... HI 

 in. The Inheritance of Glume-Length ........ 112 



IV. The Measurable Characters of the P, I, and K Glume Types in Fq, 



F2,andF3 116 



V. The Inheritance of Grain -Length . . . . . . . . 119 



VI. The Measurable Characters of the K, I, and P Grain Types in Fo , Fi, 



and ^3 . . ,. 121 



VII. Concerning the Apparent Genetic Inseparability of Certain Characters in 



the Cross 123 



VIII. An Apparent Relationship between Glume-Length and the Development 



of Hairs on the Glume ......... 125 



IX. The Inheritance of Solidness of Straw in the Cross .... 126 



X. Evidence concerning the Endosperm in Inheritance .... 126 

 XL Conclusions 129 



Tables of Frequency Distributions of Glume- and Grain-Lengths . . 130 

 Bibliography 134 



I. The Experimental Material and the Nature of 

 THE Breeding. 



The inheritance results in wheat published by Biffen (1) in 1905, 

 made it clear that certain simply " measurable " or " quantitative " 

 characters behaved, in inheritance, in much the same general fashion as 

 the "qualitative" ones. Manifestly most of the economic plant-breeding 

 questions, e.g. " yield " inheritance, must depend upon " measurable " 

 characters, and the investigations to be described were undertaken 

 with the primary object of ascertaining the precise mode of inheritance 

 of some simply measurable character. BifFen's observations on length 

 Jonrn. of Gen. x 8 



L 



