5. Chemical analyses of the carotinoid content of tetraploid corn are under way in cooperation with Professor D. B. Hand, a biochemist, with a growing interest in the chemical basis of heredity. Preliminary results indicate that the meal from the tetraploid yellows has appreciably more of the active provitamin A carotinoids, cryptoxanthin and beta carotin, than the comparable diploid yellows. The diploid yellows differ widely in the amount of carotinoids present in the meal, and from some "non-yellows" yellow pigment has been extracted. With what we now know about the genetics of yellow endosperm from Perry and Sprague's recent paper and from the earlier work, and with the method which Professor Hand has perfected for separating chemically the various yellow pigments in corn meal, it should be possible to find out something about the chemistry of gene action.