An instructional section (§30) from an International Textbook Co. correspondence course on burr picking, the first operation wool undergoes after scouring and drying. It explains why burrs and shives must be removed before carding, then describes the Parkhurst, single burr-cylinder, and Goddard (Curtis and Marble) burr pickers: their construction, drives, speeds, capacities and operation. It closes with sections on management, setting, the gauze room, and examination questions. Illustrated with line drawings of the machines, a burr wire table, and drive diagrams.