Concluding part of an article by Edward R. Schwarz of MIT on using the microscope to examine wool, woolen and worsted yarns and fabrics. It covers yarn study (surface fibers, twist faults, rayon blends), checking double cloths and backed fabrics against their designs, and using the stereoscopic microscope on pile fabrics such as Wilton carpet and mohair plush. It closes with remarks on mill quality inspection and the need for research-trained laboratory staff. Illustrated with photomicrographs (Figs. 3-11).