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Retroflex solubility curves are those of substances whose solubility decreases with rise of temperature. As an extreme case of such behavior, the manganous salts named above are here reported upon, because of the interest attaching to the extent of difference of solubility in the two available varieties of water. SUMMARY 1. Solubilities of manganous sulfate monohydrate in ordinary water have been measured in the range 85-175°C.2. A fiftyfold decrease in molal solubility is found with the rise of temperature.3. Solubility determinations of manganous sulfate monodeuterate in deuterium water have been made at three points within the temperature range, for purposes of comparison.4. The latter solubilities are lower than the former at the same temperatures, and the relative difference increases with temperature, contrary to previous findings in the case of salts whose aqueous solubility increased with temperature.5. At 138°C., equimolecular quantities of the two varieties of water dissolve numbers of molecules of the corresponding monoaquated solutes that stand in the ratio of 100 to 56. 6. It can be said that the greatest relative solubility differences of the kind here studied occur at the lowest concentrations, whether these are met with at lower or at higher temperatures.

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Beginning with this issue, Dr. Laurence S. Fosfer has stepped down from his post as Editor of the "Report" and Associate Editor of the JOURNAL. A New Englander by birth, education, and marriage, Larry has deep roots in New England soil, yet he has used this devotion to a region to extend his mission, not to limit it

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The Hydrogen OrganThe hydrogen organ is a superb device for lecture table demonstration. In one fascinating twominute period, it can safely show that hydrogen is lighter than air; that hydrogen molecules move faster than oxygen and nitrogen molecules; that pure hydrogen burns quietly with a colorless, transparent flame; and that a hydrogen-air mixture is violently explosive.

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