As we were contemplating this spectacle, MacFoy sung out something which I thought was “Vessel on the lee.” The mate then went aloft for a better view, and when he had come down I asked him if he could see the vessel, to which he replied, “St. Paul’s Rocks.” This excited us at once, and I went up to the cross-jack-yard, from which elevation I plainly saw against a dark cloud what appeared to be twin light-houses, like Thatcher’s Island lights at Cape Ann, Massachusetts. Although fifteen miles distant at the time, and the weather was slightly hazy, these two rocky columns rising from a depth of two thousand fathoms, the only land within hundreds of miles, produced an effect wonderfully majestic and solemn. The exact position of the rocks is 0° 55′ 30′′ north and 29° 22′ west, and they are five in number, though only two are of considerable altitude, the loftiest being one hundred feet in height. They are separated from each other only by narrow chasms, so that until you approach very close the appearance is that of a single island. The whole space occupied by St. Paul’s Rocks does not exceed five hundred yards in length and three hundred in breadth; and while Darwin concluded that they were not of volcanic origin, more modern scientists--Renard, Geikie, and Wadsworth--have decided that they are eruptive. These rocks are totally devoid of vegetation, but are the resort of incredible numbers of sea-birds, both gannets and noddies, as well as a certain spider, while the water in the vicinity swarms with fish, seven varieties having been taken by the “Challenger” during a very short stay. Captain (afterward Admiral) Fitzroy, when in command of the “Beagle” during her celebrated five years’ voyage, visited these rocks, and wrote an admirable description thereof. Among his observations is the following: “The multitude of birds covering the rocks was astonishing, and they suffered themselves to be kicked about and killed with sticks; at the same time those on the wing even darkened the sky. Numbers of fine fish, like the grouper of Bermuda, bit eagerly at baited hooks; but as soon as a fish was caught a rush of voracious sharks was made at him, and notwithstanding blows of oars and boat-hooks, the ravenous monsters could not be deterred from seizing and taking away more than half the fish that were hooked.” Had it been earlier in the day we would have stood in toward the rocks to behold the surf which rages incessantly against the weather-side. But it was too late; and even as we looked the lofty obelisks began to fade away, and at 6.15 we had what I hope will not be our last look at the lonely St. Paul’s Rocks. The Atlantic Ocean near the equator, between the meridians of 18° and 23°, is subject to frequent and violent earthquakes, which have the effect upon a vessel like that of being dragged over a reef, or that of a heavy chain-cable being suddenly run out through the hawse-pipes.