An approach is suggested in this paper that permits an estimation of the erodibility of soils on a basis of the percentage of particles of silt and clay aggregated. A correlation coefficient of 0.79 was obtained between the percentage of silt and clay aggregated and the erosion ratio. The erosion ratio is a rather valuable soil index, but is complex, and the determination and calculations for each of its components are rather laborious. On the other hand, the laboratory determination of

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... y the percentage of silt and clay particles aggregated can be made easy and simple. The calculations are also easy. The percentage of silt and clay aggregated is therefore a convenient index to use in assessing the erodibility of a soil. If desired, the corresponding value of the erosion ratio may be estimated with a fair degree of precision from the percentage of silt and clay aggregated.