4. Seeds received from Dr. Merle T. Jenkins were sowed and only the "dark yellow" germinated. The "lemon yellow" is very similar to some Y1 stocks I have and in my opinion must be called only "yellow" in order not to confuse it with the "lemon yellow" due to the yellow aleurone color. Dr. Jenkins' ratio 3 dark yellow (orange) : 1 yellow is identical with that I obtained in Brazilian strains (Maize News Letter 17:1943 and Amer. Nat. 79:187-192, 1945) and the gene producing the difference orange : yellow I called provisionally YD. Several crosses are now being made in order to try the location of YD and to see its interrelations with Dr. Jenkins' gene in chromosome 7.