The author reported in the previous papers that streptomycin (SM), kanamycin, and viomycin disturbed the formation of chlorophyll in the timothy (Phleum pratense) and that the seeds treated with SM during their resting condition sprouted colorless leaves lacking in chlorophyll when they were rinsed with purified water before cultivation, but that when they were rinsed with metal salt solutions and planted on the water media (this will be hereafter called the rinsing method) they sprouted chlorophyll recovered leaves.1), 2)