Excerpts from thew report Summary: In this study of conversion of the hydraulic type of cottonseed oil mill into more productive plants of the screw-press, prepress-solvent, or direct-solvent type, two general conclusions were reached: 1. When the annual volume of seed crushed is sufficient to show a profit on new investment in conversion to both the prepress-solvent and the direct-solvent type of plant, it is always more profitable to convert to the prepress-solvent type. 2. When volume is sufficient to show a profit on new investment in conversion to both the screw-press and the prepress-solvent type of plant, the profit is always greater in converting to the screw-press type of operation.