The kinetics of the hydrolysis of ethyl acetate by hydroxyl ions in dioxan-water systems also shows the same anticipated deviations from the Kirkwood picture of ion-dipole reactions. For small additions of organic solvents, more than the dielectric constant, the mole fraction of water and the changes in the environment of the transition state appear to be more significant. This is indicated by the reaction in the presence of acetate ions. The results are compared with those in acetone-water systems.