The ratio of two intensities has been used to determine the optical activity of highly scattering solutions. A modified Brice light-scattering photometer was used for this purpose. The difficulty introduced by the presence of the depolarized scattered radiation was eliminated by the imposing of a measurable rotation on the system. The imposed rotation was achieved by the incorporation of an adjustable polarizer between the analyzer and the phototransducer linked to an angular scale. The optical rotation of scattering systems having a transmission of less than 10% have been determined with an accuracy of a few hundredths of a degree, the precision being limited by the improvised angular scale.
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