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Valuable beds of gypseous marl exist in the vicinity of the Wachita, which admit of being worked to great advantage.

Gypseous marls, or calcareous marls containing a little gypsum, are preferred to limestone soils, as they allow of deep penetration of the roots of the vines.

The mineral is slightly soluble in water, one part of gypsum being soluble, according to G. K. Cameron, in 372 parts of pure water at 26� C. Waters percolating through gypseous strata, like the Keuper marls, dissolve the calcium sulphate and thus become permanently hard or “selenitic.”

This variety occurs in veins, often running through gypseous marls, with the fibres disposed at right angles to the direction of the vein.

Amusingly, Dr Michel found that some words added to the “American Heritage Dictionary” in 2000, like “gypseous” or “amplidyne”, had been in widespread use a century earlier.