From The Complete Encyclopedia of Needlework by Thérèse de Dillmont (third edition, edited by Rita Weiss and Jean Leinhauser).
Cast on 4 stitches and work in the round. To bind off: “Take the 1st st. on a crochet hook (in the repetitions, crochet this st. separately), **make 9 chain and 1 double crochet joining the next 2 sts., repeat twice from **; crochet the next 5 sts. separately, *** join the next 2 sts., 9 chain, repeat from *** three times; *. Join to the 1st st. and break off the thread.”