A mark of cadency is borne on any part of a coat that may be found most suitable for its conspicuous display, but always in such a manner that it may not be mistaken for a charge. It is generally placed somewhere in chief or sometimes in the centre of the shield, and its colour may be any that is well seen. Bossewell says (1572): “Every difference ought to be placed in the moste evidente part of the coat armour, videlicit, in the place where the same maie soonest be scene or perceived.” And another early writer indicates the distance at which a difference should be easily perceived on a banner or other flag as eighteen yards. The sons of the eldest son bear each his own difference charged upon the label of his father, and in similar manner the sons of the second son of the head of the family charge their differences on their father’s crescent, and so forth. As marking the degree of nearness to the headship of the family such distinctions are disused or changed as circumstances dictate, but in some cases a second or other junior son continues to use his difference after his father’s death in order to prevent confusion with his elder brother who has in due course succeeded to the undifferenced coat, and in spite of the inevitable clashing with the second son of that elder brother, who would also bear a crescent for difference. Such a method of distinguishing “Houses” as well as sons would, of course, become impossible in a very few generations, and this points to the superiority of the mediaeval method of differencing as well as to what is the principal weakness of modern heraldry in England as a system, namely, the want of distinction between the branches of a family. That, however, is more a matter for the scientific herald. The mark of cadency may be placed on the crest as well as on the arms, but it is not commonly done, except when the crest is used alone. It should be noted here that though daughters (other than Princesses of the Blood) do not difference their arms personally, for they rank equally among themselves, they do bear their father’s difference so long as he bears it. When by impalement or other means the individuality of the bearer is sufficiently pointed out, marks of cadency are frequently considered to be redundant, and are therefore omitted; but their inclusion is preferable. Royal cadency follows a method apart, and when arms are assigned by the Sovereign to the various members of the Royal Family, as is done by warrant on their arrival at full age, the proper individual mark of cadency is assigned at the same time. At the present day it always takes the form of a label; which is plain for the Prince of Wales, and charged in some distinctive manner for other members of the Blood Royal.