A cross involving opaque-2 made in 1942 and selfed in 1943 segregated an endosperm-color gene very closely linked with opaque. The gene has not been identified but since no gene affecting endosperm color previously has been reported in this region of Chromosome 7, the preliminary data are presented in the following table:

The data are not too satisfactory as considerable difficulty was experienced in classifying the opaque seeds for color. They indicate about 2 percent crossing over between the two loci. No symbol is suggested for the endosperm-color gene as too little information is available on it at the present time.

Merle T. Jenkins