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at first thought seems to be an even more serious problem than the two-tree house, but a glance at Fig. 6 will show how it can be built without much trouble.

First we nail the two A blocks on to the trunk, then the two B sticks. After the two B sticks are placed upon the A blocks and nailed to the tree, two more B poles must be laid over the first at right angles to them, so as to enclose the tree-trunk within a square of B sticks. Nail all four sticks securely to the tree. You will notice that in this case many of the sticks are notched near the ends, as D is in Fig. 2, and for a similar purpose, to receive and hold the ends of the struts, which are nailed at their lower ends to the king-post (trunk of the tree). It is unnecessary to notch or mar the trunk of the tree, for the ends of the struts are cut on an angle to rest flat against the trunk where they are nailed, and the nails will not injure the tree in the least.

Fig. 6 shows the roof boards laid clinker, or lap-streak fashion, from side to side. Where a roof is laid in this manner it is not necessary or desirable to nail strips over the cracks, as these are fully protected by the overlapping boards.

Wherever it seems necessary to add to the stability of the foundation of any of the club-houses described, it can be done by struts from the tree-trunk to the ends of the B sticks or other poles supporting the structure.

Fig. 7.—Three-Tree House.

Figs. 7 and 8 show, respectively,