We have now only to consider the attempts which have been made to approach the North Pole by the American route. For, though Collinson in 1850 reached high latitudes to the north of Behring’s Straits, while Wrangel and other Russian voyagers have attempted to travel northwards across the ice which bounds the northern shores of Siberia, it can hardly be said that either route has been followed with the definite purpose of reaching the North Pole. I shall presently, however, have occasion to consider the probable value of the Behring’s Straits route, which about twelve years ago was advocated by the Frenchman Lambert. Dr. Kane’s expedition in 1853–55 was one of those sent out in search of Sir John Franklin. It was fitted out at the expense of the United States Government, and the route selected was that along Smith’s Sound, the northerly prolongation of Baffin’s Bay. Kane wintered in 1853 and 1854 in Van Reusselaer’s Inlet, on the western coast of Greenland, in latitude 78° 43´ north. Leaving his ship, the _Advance_, he made a boat-journey to Upernavik, 6° further south. He next traced Kennedy Channel, the northerly prolongation of Smith’s Sound, reaching latitude 81° 22´ north. He named heights visible yet further to the north, Parry Mountains; and at the time—that is, twenty-two years ago—the land so named was the highest northerly land yet seen. Hayes, who had accompanied Kane in this voyage, succeeded in reaching a still higher latitude in sledges drawn by Esquimaux dogs. Both Kane and Hayes agreed in announcing that where the shores of Greenland trend off eastwards from Kennedy Channel, there is an open sea, “rolling,” as Captain Maury magniloquently says, “with the swell of a boundless ocean.” It was in particular noticed that the tides ebbed and flowed in this sea. On this circumstance Captain Maury based his conclusion that there is an open sea to the north of Greenland. After showing that the tidal wave could not well have travelled along the narrow and icebound straits between Baffin’s Bay and the region reached by Kane and Hayes, Maury says: “Those tides must have been born in that cold sea, having their cradle about the North Pole.” The context shows, however, that he really intended to signify that the waves were formed in seas around the North Pole, and thence reached the place where they were seen; so that, as birth usually precedes cradling, Maury would more correctly have said that these tides are cradled in that cold sea, having their birth about the North Pole.