2-,0 IV' COM'KliRNCi; INTKIîNATKiNAI.K liF. (.KNKÏIOI K . 



In llic n(>\l or fiflli f^^cneralion llireo more of tliose orij^inal linos were drop- 

 pcil'. Jlcre a^ain one finds llial two of llic original lines, viz : 112 and 121, 

 conlrihuLo oleven of Iho fiftcon selcclod oars or over 70 per cent. Line No. 

 10(1 which had six ears in Uie foiirlh génération failed to produce more Ihan 

 one ear good onoug-h lo conie inside llie firsl fiffeen. 



Passing lo Ihe sixih gcncralion one finds thaï llirec moi'e of the original 

 lines are dropped from the contesl. There are only lliree of the original twonty- 

 four ears reprosenled by progony in this, Iho sixIh génération, and one of thèse 

 (No. I2'p) contributed only a single car. 



In the seventh gênerai ion thèse saine thn^e Unes are represenled. Ilowcvcr, 

 the superiorily of line No. 1-M to produee ears high in protein is clearly évident. 

 Nineteen of the twcnty-two ears, or over 80 per cent, corne from this one line. 



In the eighth génération there is practically no change in the rclationship 

 of thèse lines. Twcnty of the twenty-two ears are fiirnished l)y line No. 121. 

 In the ninth génération line No. 1 12 drops ont and line No. 12i fails to seciire 

 a place in the lenth génération. Il lli>i>i ItappenH Ihal in Ihe tentli and elcvenlh 

 r/eneralinnu ail of lin' high ynnteni mm /•-.• the o/fspring of a sinf/le ea r \h : Nn. 121. 



It is lo he remembered Ihat this condition bas been broughl aboiit simply 

 by selecting each year those individiiai ears which showed the highesl per cent, 

 of protein. Evcryone who bas had any expérience with sélection of this kind 

 knows that many of the original lines are ahvays dropped ont as the work pro- 

 ceeds. But it is rather surprising to find so striking an example of the snpe- 

 riorily of a single line-. 



Before considering the olhcr experinienls it will be ■well to examine Ihe 

 pedigree of this line a lillle more closely. In the firsl four générations there is 

 nolhing remarkable in ils hislory. Up lo that time there are several other 

 lines which give more promise of producing liigh protein ears Ihan this one. 



Line No. 112 bas cighl ears in the fourlh génération and line No. 106 bas 

 six ears, while No. 121 bas but two. One of thèse ears (No. ilT)) bowevcr, 

 had wilhin il Ihe ability lo produce ears high in protein content. In the fiflh 

 génération this ear produced five of Ihe fifleen ears planted. This is a larger 

 number of ears high enough in protein to be selected, than had been produced 

 by any one ear up to this time. So far as can be learned from the published 

 records there are no spécial cultural reasons why the progeny of this earshould 

 bave been higher in protein tlian the progeny of other ears. 



In the sixIh génération of line 121, ear No. ôl2 produced Iwo ears and ear 

 No. 507 produced six ears ont of a total of fourleen planled. Il should be sta- 

 ted hère Ihal in this year (lOOj) a severe droughlinjurcd the corn very niuch and 

 bad considérable influence on the resulting sélection. The following quotalion 

 from the Illinois Bulletin No. 128 will make this plain : (page ifi'.h. 



•' In the case of the highprotein plol the damaging effect of Ibis drouglil 

 was so pronounced as lo render the crop almost a total failure. The yield of 

 ear corn amounted lo only aboul six bushels per acre and consisled moslly of 



1. Il sliniil<l lie nienlioneil liero llial l'or llio fiflli fioiipnilicin only fifleon ears wore selccloil ami for 

 tlic sixili i;oneralion only fourleen cars. For Ihe years following tlio nnmbor of ears selerled ranpoil 

 IVoin Iwonly-lwo (o Iwenly-livc. 



i! In llic tenlli anJ elevenlli gonoralionslhe plan of delasselingalternate rows and saving sced from 

 llicso oïdy «as pul inio elTecl. Also in thèse years î much larger number of ears wore analyzed from 

 cacli nioliier row. This change in niethod coiild not hâve effecled Ihe results bronght ont herc, because, 

 line No. 121 had demonstrated ils snperiorily several générations before this change was made. 



