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I n the majority of instances the materials used had been obtained from Kahlbaum, and in many cases they were recrystallised.Measured volumes of the solutions were mixed and made up in every case to 100 c.~,.; the mixtures then transferred to small Erlenmeyer flasks, and these were placed in a thermostat a t a constant temperature. When sufficient time, as established by preliminary expelriments, had been allowed f o r the completion of the reaction, the mercurous chloride formed was oollected in a Goocli crucible and washed. The crucible was then heated a t 105O in an air-oven until a constant weight was obtained.According t o the! customary nomenclature (Luther and Schilow, Zeitsch. physikal, Chem., 1903, 46, 777), the substance which induces the chemical change is known as the "inductor" (for example, potassium permanganate), the substance which takes part in both the changes is called the "actor " (for example, oxalic acid), and the third substance is the '' acceptor " (for example, mercuric chloride).A. Oxcrlic Acid and Mercuric Chloride m-th Various Oxidising -4gents as Inductors.(1) Inductor-Potassium Persu1phate.-Oxalic acid is slowly oxidised by potassium persulphate according to the equation : K2S,08 + H2C204 = 2C02 + 2KHS0,.

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