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The results of direct and indirect determinations of the coefficient of permeability of several undisturbed and compacted clay soils are presented. Coefficients found using a constant head permeameter device are found to be in good agreement with those calculated from consolidation test data. The theoretical existence of linear relationships between e(Void ratio ) and log k(log of coef. perm.) and between log p (log of coef. cons, pressure) and logk, are experimentally verified. Variation of soil permeability with time during extended permeameter tests is also presented.It is concluded that the uni-directional permeability of clays may be predicted as reliably from consolidation test data as from direct measurements using a soil permeameter.