Excerpt from the report Introduction and Summary: This report is a brief account of a comprehensive technical study of (1) the comparative economies of different types of cottonseed oil mills and (2) the effects of industry-wide changes in types of mills on (a) the supply and (b) price of oil and (c) the value of cottonseed sold by growers. Four types of mills were involved: Hydraulic, screw-press, direct-solvent, and prepress-solvent.