Experimental results for viscous flow of poly (${gamma}$ -methyl L-glutamate) solutions have been published elsewhere. The data of $[{eta}]^f / [{eta}]^0$ are expressed by the following equation, $frac{[{eta}^f]}{[{eta}^{circ}]}=1-frac{A}{eta^circ}{1-frac{sin^{-1}[{eta}_2(f/{eta}_0);{e}xp;(-c_2f^2/{eta}_0^2kT)]}{{eta}_2f/{eta}_0}$ (A1) where $[{eta}]^f; and; [{eta} ]^0$ are the intrinsic viscosity at shear stress f and zero, respectively, $ A{equiv}limlimits_{C{ ightarrow}0}[(1/C)(X_2/{alpha}_2)({eta}_2/{eta}_0)],{eta}_0$ viscosity of the solvent, ${eta}_2$ is the relaxation time of flow unit 2, $c_2$ is a constant related to the elasticity of flow unit 2. The theoretical derivation of Eq.(A1) is given in the text. The experimental curves of $[{eta}]^f / [{eta}]^0$ vs. log f are compared with the theoretical curves calculated from Eq.(A1) with good results. Eq.(A1) is also applied to non-biopolymeric solutions, and it was found that in the latter case $c_2 = 0.$ The reason for this is explained in the text. The problems related to non-Newtonian flows are discussed.