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91red after standing about 10 hours at 25", and solutions of " telluropentathionate " become gray after standing about 3 hours. The rate of decomposition is more rapid for the selenium compound than for the tellurium compound. Solutions of these salts are stabilized by mineral acids, whereas alkalies accelerate the decomposition. Alkali xanthates and dithiocarbamates react to give xanthates and dithiocarbamates of bivalent selenium and tellurium (synthesis 32).

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THlOSE M I CA RB AZID E 39be recrystallized from 125 ml. of hot 3% hydrochloric acid solution. The recovery of purified carbohydrazide-N,N'dicarboxamide is about 50%. PropertiesThis compound melts with decomposition at 232", is relatively nonhygroscopic, and is difficultly soluble in cold water and dilute acids. However, it dissolves to the extent of 4.72 g./100 g. of water at 65". A saturated aqueous solution hydrolyzes to a noticeable extent at 65".

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