Throughout almost the whole of the remainder of the century after the appearance of _Mare Clausum_, Selden’s authority was paramount on all questions relating to the sovereignty of the sea, and his description of the extent of the British seas was very generally adopted, both by writers and by the Government, at least in theory. But it not infrequently happened on particular occasions when a precise definition of their extent was required, that only a vague declaration was forthcoming. Again and again one finds English admirals and naval commanders imploring the Admiralty to tell them the bounds of the British seas, so that needless broils about the salute might be avoided. As a rule, no reply was given to their inquiries; and when it was, it was usually so oracular as to be of little practical advantage. Thus the Earl of Lindsey, when placed in command of the first ship-money fleet, put the question to Secretary Coke, and was told that his Majesty’s seas “are all about his dominions, and to the largest extent of those seas,” and similar explanations were given on other occasions. There is evidence that neither the Admiralty nor the law officers of the crown were able to state what the boundaries of the British seas were, and sometimes the Trinity House was appealed to, with but little better result. In truth, it was part of the national policy to leave their boundaries undetermined. The free navigation of the North Sea and the Channel was of vital importance for many of the states of Europe, and three of them at least--the Netherlands, France, and Spain--had large interests in the fisheries on the British and Irish coasts. If this country had by a formal act of state assigned definite and wide boundaries to the British seas within which sovereignty was claimed, it would have led to frequent and hopeless wars or to constant humiliation. By leaving them vague and ambiguous the pretension to maritime sovereignty could be put forward and used as a political instrument when the navy was strong and occasion offered, and when the navy was weak the pretension might fall into the background without the national honour being unduly tarnished. But on the whole, the claim to the sovereignty of the so-called British seas became an anachronism and was allowed to die out from practical affairs, surviving only in the pages of historians, naval writers, and pamphleteers. During the almost constant naval wars in the eighteenth century a new principle came into being for the delimitation of the neutral waters of a state, the extent of the adjacent open sea that might be appropriated being determined by the range of guns from the shore. All the water within reach of cannon-shot could be protected and commanded by artillery on the land, and thus made susceptible of exclusive and permanent dominion. This principle was accepted very generally by the various maritime Powers as offering a just and equitable means of fixing the limits of their territorial waters,