Excerpt from the report Summary: On the recommendation of the Cotton and Cottonseed Advisory Committee of the United States Department of Agriculture, a study was undertaken to determine: (1) The comparative economies of different types of cottonseed oil mills; and (2) the effect of industrywide changes in types of mills on the supply and the price of cottonseed oil and the value of cottonseed sold by growers. Four types of mills were studied: Hydraulic, screw-press, direct-solvent, and prepress-solvent.