Light scattering by nonspherical particles which are oriented by streaming, furnishes a method for investigating the size and shape of the scattering materials. A new experimental technique used for this investigation is the measurement of the change in the intensity of the light scattered by an isometric colloidal particles when they are oriented by a velocity gradient. The systems investigated consist of suspensions of β-FeooH crystals. The estimated lengths are found to be within the expected value as determined independently by electron microscopy.