L. C. CASE: In the article by W. T. Nightingale, “Petroleum and Natural Gas in Non-Marine Sediments of Powder Wash Field in Northwest Colorado,” in the August Bulletin, the water analysis at the top of page 1038 is evidently incorrect. Water can not have both primary alkalinity and secondary salinity, since the two are incompatible. This is probably a typographical error. However, something else seems to be wrong with the analysis. The positive reacting value is appreciably more than the total negative reacting value. Evidently some negative radical, probably CO3, has been omitted.

The sample was evidently...

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