Water contents of some clay minerals kneaded with several kinds, and concentration, of some salt solutions have been measured in the case of the liquid limit with use of the apparatus prepared specifically for the present experiments and compared with those obtained from viscosity of the media corresponding to the solutions provided ordinarily for measurement of the liquid limit. It has thus become remar-kable that continuity between the data recognized in both cases is considerably apparent even though with a slight discrepancy but to certain extent, that careful considerations on the liquid limit of the clayey materials are necessary in relation to the kinds of their own and those of the electrolytes, and that measurement of viscosity in solution suspending the clayey materials is more easily replaceable with that of the liquid limit and applicable to a part of the soil mechanics.