550 IV Cd.M'KIlK.NCK INTKUN AI liiNM.i; l)K CKNKÏJnlK. 



CrOS.'iCg (if Coliir,-<l I7iiilr>ic inlh Aun-rirou Varh'lir^. 



In l'.KI'.lîi |ilant of 1)1.", a slrainiif [lie waxy ( '.liiiicsr wilii red aloui'oiic, was 

 poUinaU'd hy a plani nf M7I. a slarchy while varioly from norllH'rn -Mexico. 

 The resulling car, Dli'J, liad ail llic seeds willi red aleurone likc llie Chinese 

 parent and ail had horny endosperm. The second generalion in IIHO, a.s secured 

 in Tour self-pollinalcd cars from Dh2, is shown in Table X. Il will be noled 

 Ihat tliis cros.s was the revei'se of Ihose shown in Ihc previous tables in that a 

 colored strain of Chinese wascrossed wilh a non-waxy white strain. In ail four 

 ears Ihe positive corrélation was belween tbe coloretl aleurone and waxy 

 endosperm instead of between Itie colored aleurone and horny endosperm, as in 

 Ihc othcr crosses where a white strain of Chinese was crosscd whith colored 

 non-waxy varietics. The percenlagc of waxy seeds in the différent ears varied 

 from 16.4 to 26. i, wliile Ihe percentage of white seeds ranged l'rom ."7.8 to 

 7 i..'( percent. 



('unclusiona. 



In the firsl or xenia génération of crosses between Chinese corn with waxy 

 endosperm and American varietics wilh horny endosperm, the waxy characler 

 is definilely récessive, ail of the seeds being horny. In the second génération 

 the waxy characters reappear in ail the ears in varying percentages. The 

 characler is definilely alternative, the seeds being eilher wa.xy or horny, wilh 

 no intermcdiates. Tiie number of waxy seeds approximales Ihe expecled 

 25 percent of a Mendelian monohybrid. The déviations, though small, are too 

 large to be ascribed to chance and occur bolli above and below the expecled 

 2j percent waxy seeds. For the whole séries of crosses Ihe percenlagc of waxy 

 seeds was 27).!, a déviation from the expecled 2") of over nine times llie |irolialilc 

 error. 



Where a Chinese variety wilh colorless aleurone was crosscd wilh an 

 American variety wilh colored aleurone, the second génération showed a 

 cohetence or positive corrélation between waxy endosperm and colorless 

 aleurone. 



Where the Chinese parent had a colored aleurone and Ihe American parent 

 was while, llie positive corrélation was belween Ihc opposite characters. waxy 

 endosperm and colored aleurone. Thèse rcsulls are intcrprelcd as showing a 

 di'finite lendency for characters thaï are associaled in the parents to appear 

 logether in the later générations of Ihe hybrids. 



Similar examples of cohérence hâve been re|)orle(l in otlier erop plants 

 though Ihis seems to l>e the first instance where Ihe corrélation is réversible. 



