The distribution functions possess maxima characteristics similar to those previously discussed for "r = 1" polymers. In fact, the same equations may be used for locating the xmax. value for * by replacing p with r!lp. Exact equations for Mw and Mz, corresponding to equations ( 13) and ( 14), are cumbersome; for all practical purposes it is permissible merely to replace p with r''lp in ( 13) and ( 14), respectively. It follows that here also the ratio of M": Mw: z approaches 1:2:3 for high molecular weights. Thus, sedimentation equilibrium measurements in the ultracentrifuge would not distinguish the two types of polymers.