'i'he zinc salts of phosphoric acid are of interest in the study of dental ccments. The following is a part of a more extended investigation of the reactions and equilibria involved in the manufacture and use of such plastic compounds. The phosphates of zinc, particularly the acid salts, have been very little studied. Graham describes an acid salt, ZnHP04.H20. Keintz3 Cf. Iiarkins and King, H IS JOURNAL, 41, 971 (19x9).

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In a study of the reactions occurring in the electrodeless discharge in water vapor consistently high yields of hydrogen peroxide were obtained. A number of reactions have been studied and by a process of elimination a mechanism for the formation of hydrogen peroxide from hydroxyl has been suggested. In the course of some spectrographic investigations of the electrodeless discharge in water vapor some new bands, with heads at 3564 and 3328A, were observed which are probably due to an ionized hydroxyl. These bands were not present in the uncondensed electrode discharge but appeared in the condensed electrode discharge at low pressures.

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This communication is an abstract of a thesis submitted by Frank Hovorka in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Chemistry at the University of Illinois.