is a triangular piece of 2-inch board, made to fit exactly in the middle of the stern, and had best be nailed in place before the boat is launched (see Fig. 117). The keel must have its bottom edge flush with the bottom of the boat, and a strip of hard-wood nailed on the stern-end of the keel and bumper, as shown in the diagram. A couple of strong screw-eyes will support the rudder. After the boat is launched the Side-Supports for the Cabin May be Erected. These are “two-by-twos” and eight in number, and each 5 feet 9 inches long. Nail them securely at their lower ends to the adjoining ribs. See that they are plumb, and fasten them temporarily with diagonal pieces, to hold the top ends in place, while you nail down the lower deck or flooring. Now fit and nail the two 1-inch planks in place, at the bow and stern-end of the cabin, each of which has its top one inch above the sides, even with the proposed deck (see dotted lines in Fig. 117). Use Ordinary Flooring, or if that is not obtainable use 3/4-inch pine boards, and run them lengthwise from the bow to the front end of the cabin and along the sides of the cabin. Then floor the cabin lengthwise from bow to stern. This gives you a dry cabin floor, for there are 4 inches of space underneath for bilge water, which unless your boat is badly made and very leaky, is plenty of room for what little water may leak in from above or below. The two side-boards of the cabin floor must, of course, have square places neatly cut out to fit the uprights of the cabin. This may be done by slipping the floor-board up against the uprights and carefully marking the places with a pencil where they will come through the board, and then at each mark sawing two inches in the floor plank, and cutting out the blocks with a chisel. The Hatch. Now take a “four-by-four” and saw off eight short supports for the two 1-inch planks which support the hatch, Figs. 116 and 117. Toe-nail the middle four-by-four to the floor in such a position that the two cross-planks (which are made to fit in the notches E and F, Fig. 114) will rest on the supports. Nail the four other supports to the side-boards of your boat, and on top of these nail the cross-planks, as shown in the diagrams. The boat is now ready for its Upper Deck of 1-inch pine boards. These are to be nailed on lengthwise, bow and stern and at sides of cabin, leaving, of course, the cabin open, as shown by the position of the boys in Fig. 117, and an opening, 3 feet by 2, for the hatch (Fig. 116). The two floors will act as benches for the uprights of the cabin, and hold them stiff and plumb. To further stiffen the frame, make two diagonals for the stern-end, as shown in Fig. 118, and nail them in place. The Rafters,