The meeting of Westerly winds within the general Limits of the Easterly Trade is a little extraordinary, and has induced former Navigators, when they met with them, to think that they were caused by the nearness of some large Tracks of Land: but I rather think they were owing to another Cause. It hath been found both by the Dolphin and us that the trade winds in those parts of this Sea doth not extend further to the Southward than 20 degrees, and without which we generally meet with a wind from the westward. Now, is it not reasonable to suppose that when these winds blow strong they must encroach upon and drive back the Easterly winds as to cause the variable winds and South-Westerly swells I have been speaking of? It is well known that the Trade winds blow but faint for some distance within their limits, and are therefore easily stopt by a wind from the Contrary direction. It is likewise known that these limits are subject to vary several degrees, not only at different seasons of the Year, but at one and the same season. Another reason why I think that these South-West winds are not caused by the nearness of any large Track of land, is in their being always accompanied with a large swell from the same Quarter, and we find a much greater surf beating upon the Shores of the South-West sides of the Islands situated just within the Limits of the Trade winds than upon any other part of them. The tides are perhaps as inconsiderable in these Seas as in any part of the world. A South or South by West moon makes high water in Royal Bay, but the water does not rise upon a perpendicular above 10 or 12 inches, except on some very Extraordinary occasions.