1. Properties of various cell-combinations were studied in order to obtain the standard of low voltage, and the following two were found to be the most reprodncible and constant :Cd amalg | Cd I₂ |Pb I₂| Pb amalg. Cd amalg (10%) |Cd SO₄ •⁸₃H₂O |Cd amalg (dilute) 2. The electromotive force of the former is 0-09838; at 20°C, and that of the latter is the order of one hundredth volt, giving different values according to the concentration of the dilute amalgam. 3. Heats of form-ation of cadmium chloride, iodide and bromide were computed by applying the Gibbs-Helmholtz equation to our results of electrical measurement. They were found to be 94090, 49340 and 74700 calories respectively. 4. The agreement bEtween the beat of formation of cadmium bromide thus computed and that obtained by thermochemical data is not so close as in the other two salts. Acc-urate thermochemical dEterminations of this heat and also that of hydration of the same salt are therefore most dsirable

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