An article on weaving the M's and O's threading, a two-block structure used for colonial linens. It gives the threading for a unit of eight or four threads per block, plus warp and weft details (Bernat perle cotton, 22 ends per inch, 328 warp threads). It includes full treadling sequences for a mat and treadling variations: plain-weave-like, single treadles for a twill effect, and a continuous horizontal stripe. It also shows pillow top and bag designs and summarizes the treadling combinations that can be woven on one threading.