The Irish Sea, separating the British Islands, rather resembles an estuary than an actual division; but history has shown the danger from it to the United Kingdom. In the days of Louis XIV., when the French navy nearly equalled the combined English and Dutch, the gravest complications existed in Ireland, which passed almost wholly under the control of the natives and the French. Nevertheless, the Irish Sea was rather a danger to the English--a weak point in their communications--than an advantage to the French. The latter did not venture their ships-of-the-line in its narrow waters, and expeditions intending to land were directed upon the ocean ports in the south and west. At the supreme moment the great French fleet was sent upon the south coast of England, where it decisively defeated the allies, and at the same time twenty-five frigates were sent to St. George's Channel, against the English communications. In the midst of a hostile people, the English army in Ireland was seriously imperilled, but was saved by the battle of the Boyne and the flight of James II. This movement against the enemy's communications was strictly strategic, and would be just as dangerous to England now as in 1690. Spain, in the same century, afforded an impressive lesson of the weakness caused by such separation when the parts are not knit together by a strong sea power. She then still retained, as remnants of her past greatness, the Netherlands (now Belgium), Sicily, and other Italian possessions, not to speak of her vast colonies in the New World. Yet so low had the Spanish sea power fallen, that a well-informed and sober-minded Hollander of the day could claim that "in Spain all the coast is navigated by a few Dutch ships; and since the peace of 1648 their ships and seamen are so few that they have publicly begun to hire our ships to sail to the Indies, whereas they were formerly careful to exclude all foreigners from there.... It is manifest," he goes on, "that the West Indies, being as the stomach to Spain (for from it nearly all the revenue is drawn), must be joined to the Spanish head by a sea force; and that Naples and the Netherlands, being like two arms, they cannot lay out their strength for Spain, nor receive anything thence but by shipping,--all which may easily be done by our shipping in peace, and by it obstructed in war." Half a century before, Sully, the great minister of Henry IV., had characterized Spain "as one of those States whose legs and arms are strong and powerful, but the heart infinitely weak and feeble." Since his day the Spanish navy had suffered not only disaster, but annihilation; not only humiliation, but degradation. The consequences briefly were that shipping was destroyed; manufactures perished with it. The government depended for its support, not upon a wide-spread healthy commerce and industry that could survive many a staggering blow, but upon a narrow stream of silver trickling through a few treasure-ships from America,