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The natural optical activity (NOA) and the refractive index are measured in the temperature intervals of 4.2 to 400 K and of 293 to 400 K, respectively. The dispersion of the NOA is best approximated by a single-term Drude formula. The parameters of dispersion formulas are given for various temperatures. A temperature dependence of NOA in CdP, is found. The temperature variation of the CdP, rotational ability is shown to be mainly due to the temperature shift of the corresponding optically active band at E = 2.4 eV. I n the 360 to 380 K temperature range a break is observed in the temperature dependence of the specific rotation and the refractive index, while the temperature dependence of the gyration tensor component displays a characteristic feature with well defined maxima, which indicates the presence of a phase transition in CdP, crystals in this temperature range.Die natiirliche optische Aktivitiit (NOA) und der Brechungsindex werden in den Temperaturbereichen 4,2 bis 400 K bzw. 293 bis 400 K gemessen. Die Dispersion der NOA liiDt sich am besten durch eine Drudeformel mit einem Term anniihern. Fur verschiedene Temperaturen werden die

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