Thus in the chess board, the use of the designation of the place of each chess man being determined only within that chequered piece of wood, it would cross that purpose to measure it by anything else; but when these very chess men are put up in a bag, if any one should ask where the black king is, it would be proper to determine the place by the part of the room it was in, and not by the chessboard; there being another use of designing the place it is now in, than when in play it was on the chessboard, and so must be determined by other bodies.