The Author discovers the south extremity of Seaborn's Land, which he names Cape Worldsend.--The compass becomes useless.--He states the manner in which he obviated the difficulty occasioned thereby.--He enters the internal world: describes the phenomena which occur.--Discovers Token Island.--Occurrences at that Island. I proceeded along the coast to the S. S. E. November 21st, 1817, the sun's altitude corrected for refraction placed us in a more northern latitude than we had left, which my officers considered as evidence of our having passed the pole and made some progress northward, and they accordingly congratulated me on the occasion. I knew better, and was perfectly aware that if the poles were open, of which I had no doubt, we must necessarily change our apparent latitude by observation very fast; and on turning the edge of the opening have a vertical sun, an equal division of day and night, and all the phenomena of the equator. To be prepared for this untried region, I calculated all the changes of the apparent altitude of the sun in all degrees of declination, as they must necessarily occur, assuming the form of the earth to be at the openings as stated by Capt Symmes in his sublime theory; and formed tables that I might be able at any time to ascertain the ship's place without difficulty or delay. We had thus far found the land to trend S. S. E. and S. Soon after noon this day we reached a cape, from which the land turned short round to the W. N. W. and continued in that direction as far as could be seen from the mast head. This being apparently the most extreme southern land of the external world, I named it Worldsend Cape. I felt no disposition to follow the coast to the N. W. although it might be found to turn again to the south. The most prudent Course appeared to be to keep sight of the land, that we might certainly find our way back again to Mr. Boneto's station. But a round about way to the internal world was not in accordance with my impatient feelings; and yet the indulgence of my desire required that I should manage with great circumspection. The compass was now of no manner of use; the card turned round and round on the slightest agitation of the box, and the needle pointed sometimes one way and sometimes another, changing its position every five minutes. I had frequently heard Slim muttering is apprehensions, and even Albicore said to me, 'I hope we shall not have any bad weather, or lose sight of the land.' My best seamen appeared confounded at the loss of the compass, and a degree of alarm pervaded the whole ship's company. I had foreseen the difficulty that might take place when I proposed to leave the land, and to avoid it had placed Slim on the larboard watch with Albicore, by which arrangement the charge of my watch (the starboard) when I was off deck, devolved on Will Mackerel, assisted by Jack Whiffle. This was mortifying to Slim, but he was aware that he deserved it.