The author tries to use measurements of light scattering to obtain information on the scattering characteristics of typical macromolecular solutions and to draw conclusions regarding their structure. The designation ″velocity change of optical anisotropy and molecular size″ is introduced to aid in determining probability values for molecular dimensions. In the discussion of intramolecular relationships, reference is made to the connection between the effects of expansion and the optical anisotropy of the scattering centers and the presence of pi -electrons. A comparison of theory and experiment with a discussion of the determination of the shape of scattering centers and the selection of suitable scattering functions is given.