Regarded as positions, therefore, these two islands are the real rivals for control of the Caribbean and of the Gulf of Mexico; and it may be added that the strategic centre of interest for both Gulf and Caribbean is to be found in the Windward Passage, because it furnishes the ultimate test of the relative power of the two islands to control the Caribbean. For, as has been said before, and cannot be repeated too often, it is not position only, nor chiefly, but mobile force, that is decisive in war. In the combination of these two elements rests the full statement of any case. The question of position has been adjudged in favor of Cuba, for reasons which have been given. In the case of a conflict between the powers holding the two islands, the question of controlling the Windward Passage would be the test of relative mobile strength; because that channel is the shortest and best line of communications for Jamaica with the American coast, with Halifax, and with Bermuda, and as such it must be kept open. If the power of Jamaica is not great enough to hold the passage open by force, she is thrown upon evasion--upon furtive measures--to maintain essential supplies; for, if she cannot assert her strength so far in that direction, she cannot, from her nearness, go beyond Cuba's reach in any direction. Abandonment of the best road in this case means isolation; and to that condition, if prolonged, there is but one issue. The final result, therefore, may be stated in this way: The advantages of situation, strength, and resources are greatly and decisively in favor of Cuba. To bring Jamaica to a condition of equality, or superiority, is needed a mobile force capable of keeping the Windward Passage continuously open, not only for a moment, nor for any measurable time, but throughout the war. Under the present conditions of political tenure, in case of a war involving only the two states concerned, such a question could admit of no doubt; but in a war at all general, involving several naval powers, the issue would be less certain. In the war of 1778 the tenure, not of the Windward Passage merely, but of Jamaica itself, was looked upon by a large party in Great Britain as nearly hopeless; and it is true that only a happy concurrence of blundering and bad luck on the part of its foes then saved the island. It is conceivable that odds which have happened once may happen again. THE END.