Concluding part (Part IV) of H. Ling Roth's series on primitive looms, from the Journal of the Royal Anthropological Institute, 1918. It describes and compares the Solomon Island (Nissan/Buka) frame loom, a Lapp braid loom with bone heddle, Norwegian and English rigid-heddle looms, Oriental vertical mat looms (Ceylon, Hong Kong, Ainu), upright and warp-weighted looms from classical sources (the Vatican Virgil, Braunius) and Egypto-Greek models, and Indian and Turkish rug looms. It also examines toothed beaters-in and bone combs from Mortlake, Kent's Cavern and Glastonbury, disputing their interpretation as weaving tools, and closes with a discussion of the origin and distribution of looms, arguing for independent invention in some cases. Illustrated with many line drawings of looms and tools.