Recent contributions by J. Císler and J. R. Philip et al. have extended some of the analytical tools developed in the present series of papers on the theory of water movement in soils. Various corrections are discussed and compared in the case of one-dimensional diffusion. It is shown that the suggestion by Cisler to correct my earlier result by simply multiplying it by a constant numerical factor is a significant improvement, particularly when the diffusivity does not vary too rapidly with water content.