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The agreement in the Kcm equivalents lends considerable weight to the view that the viscosity method for determining the molecular weight of linear polymers is quite reliable when suitable solvents are selected and a reliable KCm value is employed. There still remains, however, a lack of certainty that in some cases a true molecular dispersion of the polymer exists in solution. In the case of polystyrene, however, the fact that the same viscosity is obtained using different solvents is evidence that complete molecular dispersion probably is obtained.The question as to the reliability of the osmotic method as compared to the viscosity method for molecular weight determination cannot be finally settled at this time. This