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Water-repellency in sandy soils is determined by the amount of hydrophobic organic matter coating the sand particles and the specific surface area of the sands. The hydrophobic state can be simulated by coating hydrophilic sand with cetyl alcohol. Admixture of finely particulate materials with either naturally occurring water-repellent sands or the model cetyl alcohol-coated sand markedly reduced the water-repellency. Dispersible sodic clays were more effective than calcium saturated clays in reducing water-repellency, suggesting that the addition of dispersible, fine-grained illites and kaolinites couid play an important role in the rapid control of water-repellent soils in field situations.

O-cyclohexylidenemyoinositol. The preparation of lJ4,5,6-tetra-O-acety1myoinositol in good yield is described. 1 I 2-O-Cyclopentylidenemyoinositol has also been synthesised.IN Part I of this Series the conversion of cyclitols into their ketals with acetone was described. These compounds proved to be key intermediates for much subsequent work and,

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