Attention has recently been drawn to the existence of ‘vaccary’ walling at Wycoller, Lancashire (Antiquity, LVI, 1982, 163, Pl. xviib). Upright stones, or orthostats, occur in both field boundaries and the construction of buildings in Brittany where they are to be found in three widely-separated parts of the Province. Known areas of orthostat walling have recently been mapped in southern Finistère, between Concarneau and Pont-Aven; in southern Côtes-du-Nord between Rostrenen, Saint-Nicolas-du-Pélem and Mur-de-Bretagne; and in a large area stretching across northern Loire-Atlantique into eastern hlorbihan as far as Rochefort-en-Terre, and also into south-western llle-et-Vilaine (FIG. I).