An article by Harriet Tidball on the classical four-harness M's and O's weave, a balanced two-texture structure in which tabby and weft-rep oppose each other. It covers the character of the fabric, yarn selection (especially soft Lily 8/2 cotton versus hard-twisted linen), and the history of the technique in Swedish, Finnish and early American sources. It explains the A and B threading units, tie-up, profile drafts and the four main pattern arrangements. It also surveys published drafts from Worst, Perheentupa, Cyrus, Ingers and others, and ends by proposing a 1,4 threading to add true tabby stripes.