542.—Ancient serjeant. In English law. The eldest of the queen’s serjeants.—Ancient wall. <A _ wall built to be used, and in fact used, as a partywall, for more than twenty years, by the express permission and continuous acquiescence of the owners of the land on which it stands. Eno v. Del Vecchio, 4 Duer (N. Y.) 53, 63.—Ancient water-course. <A water-course is “ancient” if the channel through which it naturally runs has existed from time immemorial independent of the que of water which it disa