The effect of the sea-wind is not perceived to the distance of more than three or four leagues from the shore in common, and for the most part it is fainter in proportion to the distance. When it first sets in it does not commence at the remoter extremity of its limits but very near the shore, and gradually extends itself farther to sea, as the day advances; probably taking the longer or shorter course as the day is more or less hot. I have frequently observed the sails of ships at the distance of four, six, or eight miles, quite becalmed, whilst a fresh sea-breeze was at the time blowing upon the shore. In an hour afterwards they have felt its effect.* (*Footnote. This observation as well as many others I have made on the subject I find corroborated in the Treatise before quoted from the Haerlem Transactions which I had not seen when the present work was first published.) Passing along the beach about six o'clock in the evening when the sea-breeze is making its final efforts, I have perceived it to blow with a considerable degree of warmth, owing to the heat the sea had by that time acquired, which would soon begin to divert the current of air towards it when it had first overcome the vis inertiae that preserves motion in a body after the impelling power has ceased to operate. I have likewise been sensible of a degree of warmth on passing, within two hours after sunset, to leeward of a lake of fresh water; which proves the assertion of water imbibing a more permanent heat than earth. In the daytime the breeze would be rendered cool in crossing the same lake. Approaching an island situated at a distance from any other land, I was struck with the appearance of the clouds about nine in the morning which then formed a perfect circle round it, the middle being a clear azure, and resembled what the painters call a glory. This I account for from the reflected rays of the sun rarefying the atmosphere immediately over the island, and equally in all parts, which caused a conflux of the neighbouring air, and with in the circumjacent clouds. These last, tending uniformly to the centre, compressed each other at a certain distance from it, and, like the stones in an arch of masonry, prevented each other's nearer approach. That island, however, does not experience the vicissitude of land and sea breezes, being too small, and too lofty, and situated in a latitude where the trade or perpetual winds prevail in their utmost force. In sandy countries, the effect of the sun's rays penetrating deeply, a more permanent heat is produced, the consequence of which should be the longer continuance of the sea-breeze in the evening; and agreeably to this supposition I have been informed that on the coast of Coromandel it seldom dies away before ten at night. I shall only add on this subject that the land-wind on Sumatra is cold, chilly, and damp; an exposure to it is therefore dangerous to the health, and sleeping in it almost certain death. SOIL.