*43. Constituent Elements: the Conventions.*--Finally, there are those portions of the constitution which have been denominated with aptness by Mr. Dicey "the conventions."[48] The "law" of the constitution, comprising the four categories of elements which have been enumerated, is at all points, whether written or unwritten, enforceable by the courts; the conventions, although they may and not seldom do relate to matters of vital importance, are not so enforceable. The conventions consist of understandings, practices, and habits by which are regulated a large proportion of the actual operations of the governmental authorities. They may have acquired expression in written form, but they do not appear in the statute-books or in any instrument which can be made the basis of action in a court of law. For example, it is a convention of the constitution which forbids the king to veto a measure passed by the houses of Parliament. If the sovereign were in these days actually to veto a bill, the political consequences might be serious, but there could be no question of the sheer legality of the deed. It is by virtue of a convention, not a law, of the constitution, that ministers resign office when they have ceased to command the confidence of the House of Commons; that a bill must be read three times before being finally voted upon in the House of Commons; that Parliament is convened annually and that it consists of two houses. The cabinet, and all that the cabinet, as such, stands for, rests entirely upon convention. To these things, and many others, the student who is concerned exclusively with the constitutional law of the British nation may give little or no attention. But by one who is seeking to understand the constitutional system as it is and as it operates attention must be fixed upon the conventions quite as steadily as upon the positive rules of law. If the conventions are not to be regarded as technically parts of the constitution, they are at least not infrequently as binding in practice as are these rules; and they may be even more determinative of the operations of the public powers.[49] The English constitution is indeed, as Mr. Bryce has described it, "a mass of precedents carried in men's minds or recorded in writing, dicta of lawyers or statesmen, customs, usages, (p. 044) understandings and beliefs, a number of statutes mixed up with customs and all covered over with a parasitic growth of legal decisions and political habits."[50] At no time has an attempt been made to collect and to reduce to writing this stupendous mass of scattered material, and no such attempt is likely ever to be made. "The English," as remarks the French critic Boutmy, "have left the different parts of their constitution where the waves of history have deposited them; they have not attempted to bring them together, to classify or complete them, or to make of it a consistent or coherent whole."[51]