Named in honor of Joseph Walter Lewis, Jr. and his wife Anne Beech Lewis, good friends of the discoverer, on the occasion of their fiftieth wedding anniversary. Joe and Anne, an alumnus and alumna of Caltech and Stanford, respectively, have pursued distinguished civic as well as professional careers. Joe is president of DB Products, an electronic manufacturing company, and formerly vice president of Beckman Instruments. He is also a member of the Caltech Associates and has served as alumni president. Anne has been active in various civic and philanthropic organizations. Their three children, Jeff, Jack and Taffy, along with their many friends, warmly endorse this tribute. (M 21956) _ _.