Note 595 — Chapter X · THE CONNEXION BETWEEN THE OPEN-FIELD SYSTEM AND SERFDOM OF ENGLAND AND OF THE ROMAN PROVINCES OF GERMANY AND GAUL.
Reading edition
Id. p. 641; and Appendix, i. p. 285. The Irish acre is of the same form as the English—4 rods by 40—but the rod is 21 feet. See the Cartulaire de Redon in Brittany, No. cccxxvi. (p. 277), where a church is given to the abbey 'cum sedecim porcionibus terræ quæ lingua eorum "acres" nominantur' (A.D. 1061–1075). In Normandy, in the twelfth and thirteenth centuries, there were acres of four roods, 'vergées.' Id. p. cccxi. Compare also the form of the Welsh erw.