Excerpts from the report: The vegetable-oil industry rarely stores refined cottonseed oils beyond the season's requirements. Crude cottonseed oils are usually refined in a matter of days after extraction from seed to prevent ensuing quality deterioration. Information on quality changes during longer storage of refined and crude cottonseed oils is important to the industry and to the Government. If oils could be stored longer without substantial change in quality or value, more orderly and efficient marketing would be possible. Furthermore, better knowledge as to the effect of storage on oils would contribute to the production of better quality oils. Primary objectives of this study were: 1. Determination of the extent of changes in quality and value of crude and refined cottonseed oils stored under commercial conditions for longer periods than are customary in industry; 2. evaluation of present industrial methods of measuring the quality of cottonseed oils; and 3. determination of the best methods as to sizes, types, and locations of field tanks for storing oils in order to maintain quality.