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in Fig. 2; then cut four struts (E, E, in Fig. 2) and two king-posts (C, Fig. 2). Shave off the ends of the struts, as shown in the diagram, to fit the notches cut in the corbel pieces and the king-posts.

Fig. 4.—Perspective View of Corbels Resting on B Sticks.

It is not necessary to spike this frame together—the big nails might split the timber—they may be fastened together slightly with wire nails and strengthened by a piece of hoop-iron nailed on with small nails, as shown in Fig. 2 at F, F, F, F, and this will keep the pieces from accidentally slipping out of their bearings, or holes may be bored and the parts held together with screws. The real strain being an up-and-down thrust on the notches, the weight will not bear upon the iron bands or screws. Great care must be taken to make neat-fitting joints.

Fig. 5.—A Two-Tree House.