In two previous papers the stress‐strain‐time relations with respect to variables of temperature, concentration, andpH were given for attapulgite suspension in water, in terms of rheopexy (dilatancy) and thixotropy. Stress relaxation and scriptS‐like curves showing both thixotropy and rheopexy were determined at various temperatures. Yield‐point viscosities for the rheopectic and thixotropic curves showed activation energies of about 1 and 2 kcal, respectively. In the present paper Eyring's rate theory of viscosity is briefly discussed in terms of the well known generalized‐viscosity equation&eegr;=i=1iXi&bgr;i&agr;isinh−1&bgr;is˙&bgr;is˙, which is applied successfully to given flow curves. A new method for determining the parameter &bgr;iis discussed.