No. 542] 



NOTES AND LITERATURE 



115 



An ear of corn was found where only white corn had boon 

 planted, one side of which produced grains with red pericarp, 

 the other white or striped with red. The red here seemed to be 

 due to the same factor as in the case just noticed (R). Red 

 grains from this ear gave red and while ears in equal nunihers. 

 The white and striped grains gave white ears ami ears with a few 

 striped red seeds in equal numbers. A soiled red ear in this 

 generation gave three reds to one white in the next. The orig- 

 inal red and white (or striped) ear is accounted tor as a somatic 

 variation, part of the ear varying from white to red, the remain- 

 dor from white to striped. In this family red cob is perfectly 

 correlated with red pericarp. 



Two other red pericarp colors, apparently independent ol the 

 above, were found. One is a dark red occurring in stripes which 

 radiate from the point of the attachment of the silk to the grain. 

 The other is a dirty red, more abundant at the base of the grain, 

 and nearly wanting at the tip. It occurs in Palmer's lied 

 Nosed Yellow variety. It is completely coupled with red silks. 



Two other red pericarp factors were found. They are very 

 similar, but not allelomorphic to each other. They give a rose 

 red pericarp, but do not develop except in sunlight. They are 

 barely perceptible on ears covered by heavy husks. 



Red cob color proved to be dominant to white and the cross 

 segregated in a 3 : 1 ratio. Red cob appears not to be correlated 

 with any of the red pericarp colors. 3 



Red silk color presented some difficulties, and the data are not 

 analyzed. In some instances a 3:1 F 2 ratio was obtained, in 

 others a third type with red hairs on a greenish-white silk oc- 

 curred, the F 2 numbers being 198 reds, 29 greenish-whiles with 

 red hairs, and 94 greenish-whites. Red silks may occur with no 

 other red on the plant. 



Red glumes were always accompanied by red in other parts of 

 the plant, though in one race the only other red was in the silks. 



The question whether all these reds are due to one or to dil- 

 ferent genes is discussed most interestingly (pp. 109-10), but 

 the discussion is too long to quote here. 



It is gratifying to note that these authors are not afraid to 

 mention the chromosomes in connection with Mendelian factors. 



