The many mistaken ideas upon Armory, however, are not all due to the two considerations which have been put forward. Many are due to the fact that the hand-books of Armory professing to detail the laws of the science have not always been written by those having complete knowledge of their subject. Some statement appears in a textbook of Armory, it is copied into book after book, and accepted by those who study Armory as being correct; whilst all the time it is absolutely wrong, and has never been accepted or acted upon by the Officers of Arms. One instance will illustrate my meaning. There is scarcely a text-book of Armory which does not lay down the rule, that when a crest issues from a coronet it must not be placed upon a wreath. Now there is no rule whatever upon the subject; and instances are frequent, both in ancient and in modern grants, in which coronets have been granted to be borne upon wreaths; and the wreath should {xi} be inserted or omitted _according to the original grant of the crest_. Consequently, the so-called rule must be expunged. Another fruitful source of error is the effort which has frequently been made to assimilate the laws of Armory prevailing in the three different kingdoms into one single series of rules and regulations. Some writers have even gone so far as to attempt to assimilate with our own the rules and regulations which hold upon the Continent. As a matter of fact, many of the laws of Arms in England and Scotland are radically different; and care needs to be taken to point out these differences. The truest way to ascertain the laws of Armory is by deduction from known facts. Nevertheless, such a practice may lead one astray, for the number of exceptions to any given rule in Armory is always great, and it is sometimes difficult to tell what is the rule, and which are the exceptions. Moreover, the Sovereign, as the fountain of honour, can over-ride any rule or law of Arms; and many exceptional cases which have been governed by specific grants have been accepted in times past as demonstrating the laws of Armory, when they have been no more than instances of exceptional favour on the part of the Crown.