•2->', l\ CIIMKIIKNCK |\ï..l;\\ I H i\ \I.K l)i; i,km';ïii.)1 I". 



Thaï llie sirikinfj; resiills sliowii in llicsc laides were nol (lue lo llic cIVitI 

 of l'iiviroiinu'nlal circumslanccs is dcarly sliown hv Ihc analyses IVnni lin- 

 so-calk'd " mixcd protein " ami " niixcd-oil " |iluls. In liiese plots kernels IVoiu 

 the hif^li and llie low slrains weie planled in tlie same liills. Snbse(iniMil 

 analyses shovved that under tiiese conditions llie varions slrains maintained 

 Iheir respective chemical characteristics. Tiius Ihere cannol 1)0 Ihe least 

 (louht but lliat certain iharaclers were fixed' in thèse varions slrains by liie 

 sélection practiced. 



At the time that the sélections were niade a careful record of llie pedit;ree 

 of each ear was kept. Thèse pedigrees are. of course, for Ihe maternai side 

 only, since hand pollination was not practiced. In Ihc appendix to bulletin 

 No. l'JS ail the analyses for the len years are given and arranged in such a way 

 that it is possible to trace ont the pedigree of each individual ear. It is froni 

 tins data that the foUowing pedigree tables (Tables, T), I, :>, and tl) hâve been 

 constrncte<l. In Ihe l'ollowing discussion it will be advantageous lo tnke each 

 jdol separalely. This may be donc in the onlcr in wliiih they occur in the 

 bulletin. 



II11//1 l'iuU'in Cijrn. 



As slated abovc twenty tour cars containing Ihe highest [)er cent uf prolcin 

 were selected from the one huudred and sixty-three ears analysed in iN'.Ki. 

 Thèse were given registry nund)ers Iroiu iOl to I2i inclusive as shown in 

 column one of table 5-. 



The next season four sound eais were analysed from eat-h of Ihe twenls- 

 four rows. From thèse ninely-six ears, llie twenly-four again liaving Ihe 

 highest per cent of prolcin were selected for planting. The distribution of 

 thèse selected ears among the Iwenty-four original ears is shown in column 

 two of table T). Fur example it is seen that car No 124 produced two car- 

 (nos '2l(i and 2(lil) whicli were among the first twenty-four as regards prolcin 

 content. Kar No. hJTi on the olher hand failcd to produce any ear (so far as 

 the t-ars analysed showed) suflicenlly rich in protein to be included among the 

 first Iwenty-four. In this way it is seen at once that eighl of the twenly-four 

 original ears fait to be represenled in the second génération while eighl olher 

 ears conlribule two ears each for planting in the following year. Exactly the 

 same sélection was practiced in the second year and the resulting selected ears 

 are shown in Ihe third column of table r>. Of the sixteen original ears repre- 

 senled in the second génération, only one. viz : No. 110, was dropped ont in Ihe 

 third génération. In the next génération Ihere is a very significant dropping 

 oui of some of the original Unes. Thus in Ihis fourlh génération, only !l of Ihe 

 original twenly-four ears are represenleil by progeny. Fivc of the original 

 lines conlribule twenty of the twenly-four cars, or 80 per cenl in tins géné- 

 ration while two lines. viz : lOli and 112 conlribule fourleen ears or nearly 

 sixly per cent. Tluis at Ihe end of the fourlh génération it is clear that certain 

 of the original lines hâve a nuich grealer lendency lo produce ears \\ith a high 

 percent of protein. By simplyselecling on the basisof the protein content ofthe 

 indiv idual ear. for four years. 71 • per cenl of Ihe original lines hâve been dro|iii(>d. 



I. Iliis |](iiii( i.s aUo Ijioiiglil oui iii :i rrcciil pu|)cr li\ L. 11. Sinrii. ■ liiiiviisiii- i'ioiriii ^iiul I ;it 

 III l'.i>ni '. Àmniain Uieeders, Assoi: lirporl., vol. VI. pp. .">-ll, l'.tll. 



i. l'or l'oiivenience thèse car.s will be callod the lirst generalion ul' liigli-prolein corn. 



