The previous article mentioned male-sterile mutants ms1 and ms2 anddescribed the genetics of a new male-sterile mutant, ms3. We now have evidencefor a fourth completely male-sterile type controlled by a single recessive gene at a different locus from either ms1 , ms2 or ms3. As a result ofthe present study, this mutant was assigned a Genetic Type Collection T-number(T274) and the gene symbol ms 4 by the Soybean Genetics Corrmittee. This line is maintained as the heterozygote T274H .