In some Yukon canoes, however, the bottom sheet was often made of three pieces and covered not only the bottom but also a portion, such as the after two-thirds, of one side. The forward portion of that side would then be covered by a single large panel or perhaps two, so that the horizontal seam on that side would run from the stem aft to the inboard end of the foredeck and would be just above the chine. On the opposite side a sheet would cover the bottom there and the bow topside from the stem aft for a short way. Deep panels would then cover the rest of that side to the stern, so that the horizontal seam there began forward at the sheer, some feet abaft the bow, and swept downward in a gentle curve to near the chine and then ran aft to the stern in a long sheered line just above the turn of the bilge, rising slightly as it neared the stern. Hence the foremost of the panels on that side was nearly triangular and the others were nearly rectangular. Inside, at the chine, was placed a reinforcing strip of bark wide enough to reach 3 inches beyond both sides of each chine longitudinal and running the length of the bottom; or if a seam near the chine permitted, the side and bottom pieces were overlapped. As has been noted, in the Yukon canoes a reinforcing piece at the outwale was not used, but was in the Mackenzie canoes; it extended down the side about 3 inches below the underside of the outwale amidships and ran to the ends of the canoe, or nearly so, tapering with the outwales to a width of about 1½ inches at bow and stern. In these canoes much of the lashing at stem and stern was double-thong; the longitudinal sewing was often over a batten in the usual spiral stitch, and a simple spiral stitch was also used to join the panels, although in-and-out stitching might also be seen in some canoes. In many of the kayak-form canoes two ribs often stood noticeably close together amidships, and the rest stood parallel to the rake of the end on their side, respectively, of the middle ribs. However, not all these canoes had such double ribs; some were framed out in the usual manner, with the ribs widely spaced and canted toward their respective ends of the hull, away from the midship of the canoe. [Illustration: Figure 150 KAYAK-FORM CANOES OF THE ALASKAN ESKIMOS and Canadian Athabascan Indians: chine form of Eskimo birch-bark canoe (above) and the dish-sectioned form of the Canadian Athabascans.] In most of these canoes the paddler sat on a sheet of bark secured on the bottom; this was held in place by one or two false ribs having their ends under the inner gunwales and their middle forced down against the bark on the bottom framework. In place of bark, some Eskimo builders of the type used thin splints of wood laced together by two or three lines of double-thong stitching athwartships, which was passed through two holes in each splint. This might be loose or held in place by a false frame.