COUNTERCHANGING is dividing the field of a Shield in such a manner that it is, _e.g._ in part of a metal and in part of a colour, and then arranging the charges in such a manner that they shall be reciprocally of the same colour and metal: thus, the shield of John Fenwick, No. 70 (R. 2) is,--_per-fesse gu. and arg., six martlets, three, two, one, counterchanged_; that is, the field is red in chief and silver in base, and the birds or parts of the birds on the red field are silver, and those on the silver field are red. DIAPERING.--This term denotes a system of decorating plain surfaces in various ways, which was in great favour with the early heraldic artists. In the use of Diaper, which is often desirable when artistic reasons suggest its suitability, care must be taken that the decorative designs and patterns do not in any way admit of their being mistaken for charges. This diaper may be executed in low relief, subordinated to the relief of the charges; and it is not required to yield any obedience to the law of tinctures. In the Shield, No. 68 (the original, a very noble shield, is at Castle Acre Priory, Norfolk), which is simply _chequée_, the Diapering may be alternately azure and or on the squares that are alternately or and azure; or the Diaper may be dark blue, or sable, or argent on the azure squares, and on the golden ones whatever the artist might consider would be most effective; but the Diaper, in this and in all other examples, must always be subordinate to the area and tincture of the field. The finest known early example of heraldic Diaper in enamel, is the Shield of WILLIAM DE VALENCE, Earl of PEMBROKE, in Westminster Abbey, A.D. 1296. Very beautiful early examples of Diapering have been preserved in relics of heraldic stained glass. [Illustration: No. 68.--Shield of Arms of Earl de Warrenne, Castle Acre Priory, Norfolk.]