Abstract
1. The use of the corn-pollinator is recommended to amateur investigators. 2. The P(Pr), R, and C factors for aleurone color, variously combined, gave predictable and readily distinguished ratios. 3. In many cases the exact genotype, with reference to the R and C factors, can be distinguished by superficial appearance. 4. The particolored grains of East and Hayes were identified. In these some partial substitute enables the P and R factors to express themselves, even in the absence of C. This substitute is heritable, but its effectiveness is limited by local conditions in different parts of the ear or of the plant as a whole. 5. Mottling (Emerson), which occurs when the R factor comes in with the male parent only, is conditioned by the presence of a heritable factor or factors. This factor occurs in the C tester family, and is dominant in crosses with families which do not show mottling. The R tester family seems to contain a different factor, which produces apparent mottling only in a small percentage of the expectations.
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