The following story is reprinted from Can Such Things Be?. 1893. A LETTER FOUND AMONG THE PAPERS OF THE LATE MORTIMER BARR You ask me if in my experience as one of a pair of twins I ever observed anything unaccountable by the natural laws with which we have acquaintance. As to that you shall judge; perhaps we have not all acquaintance with the same natural laws. You may know some that I do not, and what is to me unaccountable may be very clear to you. “You, too, Miss Margovan, have a double: I saw her last Tuesday afternoon in Union square.”