Light scattering by nonspherical particles which are oriented by streaming, furnishes a method for investigating the size and shape of the scattering materials [1-41. A new experimental technique used for this investigation is the measure-ment of the change in the intensity of the light scattered by polymer single crystals when they are oriented by a velocity gradient. The systems investigated consist of suspension of polymer single crystals of polyethylene. The estimated lengths are found to be within the range of the expected value as determined independently by electron microscopy.