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A group of isostructural compounds of hexavalent and tetravalent uranium and plutonium with tetraethyl and tetramethyl ammonium chloride (types----(R~N)2MC1 e and (R4N)2MO2C14) have been characterized by their optical properties and by X-ray diffraction analysis. Some errors in earlier data have been corrected and explained. The isostructuralism is maintained throughout the group, as evidenced by both crystal morphology and X-ray crystallography, although the space groups range from cubic to monoclinic. The monoclinic crystal has a fl angle of 90.0 °. EUGENE STARITZKYAND JOSEPH SINGER 537

free of other barium salts); no transfer of the sample from its preparation tube to the apparatus is necessary if the sample has been collected or prepared in a standard taper centrifuge tube (The preparative or collecting test tube becomes test tube A); test tube G can be removed and placed in position A for the preparation of a uniformly mixed sample or for conversion of the obtained barium carbonate to carbon dioxide for other uses; and by use of preweighed centrifuge tubes gravimetric assay of the resulting barium carbonate is possible.The results in Table I wTere obtained with this equipment. Easily oxidizable and refractory materials were utilized and results with or without catalyst and with and without recycling are reported.

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