Volume 90 of the I. C. S. Reference Library, a correspondence-school textbook on the preparation of wool for woolen and worsted manufacture. It covers the wool fiber, sheep breeds and wool qualities, sorting, scouring, drying, burr picking, carbonizing, mixing, oiling, woolen carding, card clothing and grinding, mule spinning, and warp preparation (spooling, dressing, beaming). Each section ends with examination questions, and the book has many line drawings of machines and a general index.