3. In 1938 one of the selfed ears obtained from a selfed line previously inbred for 6 generations was segregating for sugary seeds. Since there was no evidence of out-crossing and none of the ears from numerous sister plants selfed in 1938 and in the same progeny replanted in 1939 from remnant seed segregated for sugary seeds, it seems certain that the sugary gene arose as a mutation. Crosses made in 1939 identified the mutant gene as su.
M. T. Jenkins