An International Textbook Company instruction paper (Serial 5473A, Part 1) on cotton slashing, the sizing and drying of warp yarn and winding onto loom beams in cotton mills. It covers the purposes of slashing and sizing, slasher types, creels, size boxes, squeeze rolls, steam connections, drying cylinders and condensate removal, automatic size-level and temperature controls, drives, beam pressers and measuring motions. Later sections describe high-speed slashing systems with stretch control and movable creels, and automatic size-cooking and size-room equipment. It is illustrated with engineering drawings and piping diagrams and contains no weaving drafts.