The next attempt to complete the coast of the American mainland was made from the land, and at the cost of the Hudson's Bay Company. Really it was the expedition proposed by Simpson some five years before, of which he would have been the leader had he not been shot; and it was entrusted to the capable hands of Dr. John Rae. After wintering at York Factory, Rae reached Repulse Bay with two boats, the _Magnet_ and _North Pole_, on the 25th of July, 1846, and in his usual style started immediately across the chain of lakes and portages which make up the isthmus that now bears his name, launching his boats in the tidal water of Committee Bay on the 1st of August. Stopped by ice on the west side and then on the east he returned to Repulse Bay, where he built Fort Hope of stones and roofed it with sails, and lived in it through the winter on what he could shoot and catch, for many weeks venturing on only one meal a day. Outside the men kept themselves warm chiefly by building snow houses and playing football; inside, as the only fuel used was for cooking, the only thing they could do was to wrap themselves in furs, and trust to their natural heat in a temperature that ranged about zero. [Illustration: FRACTURED STERN-POST OF H.M.S. "TERROR"] In April, with a couple of sledges, eight dogs, and five men, he crossed the isthmus again and went straightaway up the east side of Boothia to Ross's farthest south, thus completing that coast-line. Back he went to Fort Hope after a trip of nearly six hundred miles, to start again on the 12th of May up the west coast of the Melville Peninsula to Cape Ellice, which Parry had sighted from the strait on that side. And he was back once more at Fort Hope on the 9th of June. Thus the survey of the northern coast was complete with the exception of the gap between the Boothia isthmus, on the west side, and Castor and Pollux River of Dease and Simpson, which Rae in another famous effort from Repulse Bay was to link up later on. When Rae reached Lord Mayor's Bay on the east coast of Boothia, Franklin, with the _Erebus_ and _Terror_, was off its west coast in the same latitude. This was the reappearance of the _Terror_ in the north. After Back's voyage she had been repaired to sail with the _Erebus_, under Sir James Clark Ross, when he discovered the South Magnetic Pole; and on their return the barques had been thoroughly overhauled and fitted with auxiliary screws, the first time that the screw propeller was used in Arctic work. Franklin was in the _Erebus_, the _Terror_ being commanded by Francis R. M. Crozier as she had been in the Antarctic voyage. Crozier was one of Parry's men, he having been in the _Fury_ in 1821 and in the _Hecla_ on her two subsequent expeditions.