A one-page technical article by Wm. Watson on how the direction and amount of yarn twist affect a fabric's handle, strength, and appearance. It explains open-band and cross-band twist, the usual twist directions for cotton, worsted, and woolen yarns, and folded yarns. It also covers how warp and filling twist combine, and how twill line direction should relate to surface twist to make twill lines bold or indistinct. A diagram (A-F) illustrates the twist directions and thread crossings.