An International Correspondence Schools instruction paper (Serial 512) on leno, or gauze, weaves as woven on dobby looms. It covers plain gauze with bottom and top doups on close-shed and open-shed looms, including the standard, doup, ground and back harnesses, the slackener, jumper and yoke, and how to write harness and chain drafts. The second half treats fancy gauze: combinations of right- and left-hand doups, multiple picks before douping, multiple doup or ground ends, several sets of doups, combinations with plain weaves, effects without extra mechanisms, and dissecting leno cloth. It is illustrated with many mechanism drawings, weave diagrams and chain and drawing-in drafts.