According to accurate astronomical observations, the middle of this group lies under 11 deg. 19' 21" latitude, and 192 deg. 25' 3" longitude. In comparing the situation of the Pescadores, as given by Captain Wallis, their discoverer, with this observation, it is scarcely possible to believe in the identity of the groups. I have, however, left them the name of Pescadores, because the two observations nearly correspond. After having sailed round the whole group, we came, at four o'clock in the afternoon, so close to their north-western point, that every movement on land might have been distinctly seen with the naked eye; yet even here there was nothing to indicate the presence of man, though Wallis communicated with the inhabitants, if, indeed, these islands be really the Pescadores. If so, these people must have become extinct long ago, as no monument of their former existence is now visible. When we had completed our survey, we again proceeded westward, and, within half an hour, the watch again announced land in sight. The evening was now so far advanced, that we determined to lay-to, in order to avoid the danger of too near an approach to the coral reefs during the night, and deferred our survey till the following morning. At break of day we saw the islands which we have called the Pescadores, lying six miles to the eastward; whilst those which had risen on our horizon the preceding evening had wholly disappeared. We had diverged from them in the night; but, with a brisk trade-wind, we regained the sight of them in an hour. At eight o'clock in the morning we came within three miles of the nearest island, and running parallel with the land, began our examination. It was another group of coral islands connected by reefs round a basin. Here also vegetation was luxuriant, and the cocoa-trees rose to a towering height, but not a trace of man could be discerned; and we therefore concluded they were uninhabited, as we were near enough to distinguish any object with the naked eye. Favoured by a fresh breeze, we sailed westward along the islands, till nightfall, without reaching the end of this long group. During the night we had much difficulty in keeping our position, owing to a tolerably smart gale, which, in these unknown waters, would have been attended by no inconsiderable danger, but that the land lay to windward of us; and were therefore well pleased in the morning to find that the different landmarks by which we had been guided overnight, were still visible, so that we were enabled to pursue our observations without interruption. The greatest length of this group, which I named, after our second lieutenant, Rimski-Korsakoff, is from east-north-east to west-south-west, in which direction it is, fifty-four miles long. Its greatest breadth is ten miles. As we were sailing along the islands to windward of us, we could plainly distinguish from the mast-head those which lay at the other side of the basin.