The ribs are each the same length as the end-board, A and A´ of Fig. 115, and are nailed in place in the same manner. Each bottom-rib must have a notch 2 inches deep cut in the bottom edge to allow the free passage of water, so as to enable you to pump dry. Commencing at the stern, the distance between the inside of the bumper and the first rib is 1 foot 6 inches. This is a deck-rib, as may be seen by reference to Figs. 116 and 117. After measuring 1-1/2 feet from the bumper, on inside of side-board, mark the point with a carpenter’s pencil. Measure the same distance on the centre-piece, and mark the point as before; then carefully fit your rib in flush or even with the top of the side-piece, and fasten it in place by nails driven through the side-board into the end of the rib, and toe-nailed to centre-piece. Do the same with its mate on the other side of centre-piece. The Cabin of this House-Boat is to fit in the space, A, B, D, C of the centre-piece, Fig. 114. There is to be a 1-inch plank at each end (see Fig. 117), next to which the side-supports at each end of cabin fit. The supports are two-by-twos; so, allowing 1 inch for the plank and 2 inches for the upright support, the next pair of ribs will be just 3 inches from A B, Fig. 114, of the centre-piece (see Figs. 116 and 117). The twin ribs at the forward end of the cabin will be the same distance from D C, Fig. 114, as shown in the plan and elevation, Figs. 116 and 117. This leaves five pairs of ribs to be distributed between the front and back end of the cabin. From the outside of each end-support to the inside of the nearest middle-support is 2 feet 6 inches. Allowing 2 inches for the supports, this will place the adjoining ribs 2 feet 8 inches from the outside of the end-supports. The other ribs are placed midway between, as may be seen by the elevation, Fig. 117. There is another pair of Deck-Ribs at the forward end of the cabin, which are placed flush with the line D, C, Fig. 114 (see Figs. 116 and 117). The two pairs of ribs in the bow are spaced, as shown in the diagram. This description may appear as if it was a complicated affair; but you will find it a simple thing to work out if you will remember to allow space for your pump in the stern, space for the end-planks at after and forward end of cabin, and space for your uprights. The planks at after and forward end of cabin are to box in the cabin floor. The Boat May Now be Launched by sliding it over the rollers, which will not be found a difficult operation. The Plans Show Three Lockers --two in the bow under the hatch and one under the rear bunk--but if it is deemed necessary the space between-decks, at each side of the cabin, may be utilized as lockers. In this space you can store enough truck to last for months. A couple of doors in the plank at the front of the cabin opening, under the deck, will be found very convenient to reach the forward locker in wet weather. [Illustration: FIG. 119.] The Keel