COMPARISON OF CANOE ON THE BUILDING BED (above), with gunwales or building frame weighted down by stones inside bark cover, and (below) canoe when first removed from building bed during fifth stage of construction. (_Sketches by Adney._)] In making the canoe watertight, it is to be remembered that some forms of stitch make the bark lie up tight all along its edges while others bind only where the stitch crosses the seam. The in-and-out stitch, which was used only above the waterline, cannot be pulled up hard without causing the bark to pucker and split and cannot be made very watertight with gum. The over-and-over stitch, in either a spiral form or square across the seam on the outside and diagonally on the inside, is very strong; when a batten is used under the stitches it can be pulled up hard and allows a very watertight gumming. When this style of sewing is used without a batten across the run of the grain, as in the gore seams, it cannot be pulled up as hard, but will serve. Back-stitching, which was much used in the topsides, can be pulled up quite hard and makes a tight seam when gummed, as do the harness stitch and cross-stitch. The ends, regardless of the style of sewing used, were more readily made tight by gumming than the other seams in a bark canoe. Two basic methods, with some slight and unimportant variations, were used to fasten the bark to the gunwales. One employed a continuous over-and-over stitch, the other employed groups of lashings. On a canoe with the lashing continuous along the gunwales, the turns were made two or more times through the same hole on each side of each rib head to allow space for them. This might also be done where the lashing was in groups, as described above. Usually, a measuring stick was used to space the groups between thwart ends so that each group came between the rib heads. The groupings could be independent lashings, or the strand could be carried from one group to another. If the latter, it was passed along under the gunwale in a number of in-and-out stitches or in a single lone stitch either inside or out, or else it was brought around over the gunwale from the last full turn. Some tribes use both ends of the lashing, passing them through the same hole in the bark from opposite directions below the gunwales; the ends might be carried in the same manner in a long stitch to the next group. In some elm and other bark canoes employing basswood or cedar-bark lashings the bark was tied with a single turn at wide intervals; when roots were used in these, however, small groupings of stitches were customary. When group lashings were used with birch bark, the intervals between groups was usually relatively short, though in a few canoes the groups and intervals were of nearly equal length. [Illustration: Figure 38