Perhaps the reader needs another explanation--how it was, that amid all that fleet of ships, there was not one Yankee. This explanation is almost as easy as the other. Commerce is a sensitive plant, and at the rude touch of war it had contracted its branches. The enemy was fast losing his Mediterranean trade, under the operation of high premiums for war risks.
We began now to observe a notable change in the weather, as affected by the winds. Along the entire length of the American coast, the clear winds are the west winds, the rain-winds being the east winds. Here the rule is reversed; the west winds bringing us rains, and the east winds clear weather. The reason is quite obvious. The east winds, sweeping over the continent of Europe, have nearly all of their moisture wrung out of them before they reach the sea; hence the dryness of these winds, when they salute the mariner cruising along the European coasts. Starting now from the European seas as dry winds, they traverse a large extent of water before they reach the coasts of the United States. During the whole of this travel, these thirsty winds are drinking their fill from the sea, and by the time they reach Portland or Boston, they are heavily laden with moisture, which they now begin to let down again upon the land. Hence, those long, gloomy, rainy, rheumatic, easterly storms, that prevail along our coast in the fall and winter months. The reader has now only to take up the west wind, as it leaves the Pacific Ocean, as a wet wind, and follow it across the American continent, and see how dry the mountains wring it before it reaches the Atlantic, to see why it should bring us fair weather. The change was very curious to us at first, until we became a little used to it.
Another change was quite remarkable, and that was the great difference in temperature which we experienced with reference to latitude. Here we were, in midwinter, or near it, off the south coast of Spain, in latitude 36°, nearly that of Cape Henry at the entrance of the Chesapeake Bay, and unless the weather was wet, we had not felt the necessity of a pea-jacket. Whence this difference? The cause, or causes, whatever they are, must, of course, be local; for other things being equal, the heat should be the same, on the same parallel of latitude, all around the globe which we inhabit. Captain Matthew F. Maury, of the late Confederate States' Navy, to whom all nations accord, as by common consent, the title of Philosopher of the Seas, accounts for this difference of temperature in the following manner: "Modern ingenuity has suggested a beautiful mode of warming houses in winter. It is done by means of hot water. The furnace and the caldron are sometimes placed at a distance from the apartment to be warmed. It is so at the Observatory. In this case, pipes are used to conduct the heated water from the caldron under the Superintendent's dwelling, over into one of the basement rooms of the Observatory, a distance of one hundred feet. These pipes are then flared out, so as to present a large cooling surface; after which they are united into one again, through which the water, being now cooled, returns of its own accord to the caldron. Thus, cool water is returning all the time, and flowing in at the bottom of the caldron, while hot water is continually flowing out at the top. The ventilation of the Observatory is so arranged that the circulation of the atmosphere through it is led from this basement room, where the pipes are, to all parts of the building; and in the process of this circulation, the warmth conveyed by the water to the basement, is taken thence by the air; and distributed all over the rooms.