There Are No Windows
to the underground house, and but two openings: one in the roof for the ventilator, and the doorway, Q, S, L, J, Fig. 77. Since the outside of the wall of this sort of a house is hidden by earth, it is not necessary to remove the diagonal braces upon the ends or sides, but the inside should be neatly finished, and the four sides must be boarded up from the inside, after which the side-walls to the passageway may be nailed on from the outside, the boards running from the floor to the string-pieces, Q, U and S, V, as shown in Fig. 79. When this is finished, roof the house, laying the boards parallel with A, E and C, G, and allowing them to project front and rear and overlap at the sides. Over each crack in the roof nail another plank, as shown in Fig. 79.