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Apparatus (The General Electric Co. Ltd., 1950) is described whereby the saturation temperature (with respect to a given solute) of a solution of known or unknown composition can be measured while the bulk of the solution is at a temperature several degrees above or below that of saturation. There is no need to bring the whole of the solution into equilibrium with excess of solute at any time or to change its temperature. In the apparatus, a current of the solution is passed through an adjustable heater to a cell containing a piece of solute, and the measurement is based on observation of the refractive‐index gradient in the solution near the solid. The method is of particular value for measuring the degree of supersaturation maintained in a crystal‐growing tank, and also for the construction of solubility curves.

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