“…Under an ongoing programme we have been investigating effects of some physical and chemical factors that can modify physiological as well as genetic influence of 1, 3-Propane sultone (PS) (Kaul and Singh 1971, Singh and Kaul 1978a, Singh et al 1979b, Singh and Sha msherry 1985, Singh and Kaul 1985. The present report puts on record effects of pre-soaking, post-washing, redrying and storage on mutation frequency, mutagenic effectiveness and mu tagenic efficiency of PS.…”