A 1924 second-edition textbook on the raw materials of the woolen and worsted industries, written by Stanley H. Hart for the Philadelphia Textile School and revised by Edward W. France. It covers wool fiber structure and properties, classes of fleece wool by sheep breed (Merino, long-wool, down breeds, crossbreds, carpet wools), shearing and marketing, grading and sorting, shrinkage, pulled wool, mohair and other hair fibers, and reworked wool and waste products. It closes with a history of US wool growing, statistical appendix tables, sheep score cards, and a glossary. Many photographs and diagrams of sheep breeds, shearing, warehouses and wool samples illustrate it.