Excerpts from the report: The growth in recent years in the number of cotton gins installing and using additional cleaning and drying equipment has raised questions as to the effect of these cleaning practices upon the quality and value of cotton fiber. If, as has been alleged, these cleaning practices seriously impair the fibers processing potential and utility, market outlets for cotton may be seriously affected. The overall objective of the study, a segment of which is covered by this report, is to determine the effect of various combinations of cleaning and conditioning equipment and practices on returns to producers, gin costs, fiber properties, processing costs of mills, and value of end products. This report is confined to that segment of the study relating to the effect of cleaning practices on selected fiber properties and on spinning performance.