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each about two feet long. See A, A, and A′, Fig. 1.

As it is best to have the bottom of your house level, you must manage to nail the A blocks the same distance above the ground on each side of each tree—that is, if the ground is level; if not, you must allow for the slant of the earth. Spike the blocks securely to the trees with six-inch nails, using about three nails to each block.

Fig. 3.—End View of Corbel Resting on B Sticks.

The foundation of the house may be higher than your ladder will reach. In this case cut two more poles and four more blocks, and at the point where the top of your ladder reaches spike on the blocks, and then rest