Some heraldic writers also speak of _varry_ as meaning the pieces of which the vair is composed; they also use the terms _vairy cuppy_ and _vairy tassy_ for _potent-counter-potent_, perhaps from the drawings in some instances resembling _cups_; that is a possible meaning of _tassa_. It may be said that all these variations of the ancient _vair_ arise from mere accident (generally bad drawing), supplemented by over refinement on the part of the heraldic writers who have described them. This generalisation may be extended in its application from vair to many other heraldic matters. To all intents and purposes British heraldry now or hitherto has only known vair and potent. One of the earliest rules one learns in the study of armory is that colour cannot be placed upon colour, nor metal upon metal. Now this is a definite rule which must practically always be rigidly observed. Many writers have gone so far as to say that the only case of an infraction of this rule will be found in the arms of Jerusalem: Argent, a cross potent between four crosslets or. This was a favourite windmill at which the late Dr. Woodward tilted vigorously, and in the appendix to his "Treatise on Heraldry" he enumerates some twenty-six instances of the violation of the rule. The whole of the instances he quoted, however, are taken from Continental armory, in which these exceptions--for even on the Continent such _armes fausses_ are noticeable exceptions--occur much more frequently than in this country. Nevertheless such exceptions _do_ occur in British armory, and the following instances of well-known coats which break the rule may be quoted. The arms of Lloyd of Ffos-y-Bleiddied, co. Cardigan, and Danyrallt, co. Carmarthen, are: "Sable, a spearhead imbrued proper between three scaling-ladders argent, on a chief _gules_ a castle of the second." Burke, in his "General Armory," says this coat of arms was granted to Cadifor ap Dyfnwal, ninth in descent from Roderick the Great, Prince of Wales, by his cousin the great Lord Rhys, for taking the castle of {86} Cardigan by escalade from the Earl of Clare and the Flemings in 1164. Another instance is a coat of Meredith recorded in Ulster's Office and now inherited by the Hon. Richard Edmund Meredith, a judge of the Supreme Court of Judicature of Ireland and a Judicial Commissioner of the Irish Land Commission. These arms are: "Gules, on a chevron sable, between three goats' heads erased, as many trefoils or." An instance of comparatively recent date will be found in the grant of the arms of Thackeray. A little careful research, no doubt, would produce a large number of English instances, but one is bound to admit the possibility that the great bulk of these cases may really be instances of augmentation.