Graphic representation of Kapteyn's transformation of grain-size distribution is derived by utilizing logarithms of settling velocity and a probability chart. This method permits characterization of the resulting distributions depending on mean grain size and sorting. The occurrence of negative phi skewness is discussed, and it is concluded that some occurrences result from hydrodynamic processes and not from mixed modes or winnowing. Construction of an "ideal" log hydrodynamic probability chart makes it possible to examine the actual deviations.

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