Fig. 161—Cut short slits on the end of the ceiling cards.

Make the ceiling of the lower story of two more pairs of cards fastened together like [Fig. 158], and on the ends of each pair of cards cut similar divisions, only have them quite short ([Fig. 161]). Bend down all of the end divisions and fit the strips over across the top of the first story from front to back, bringing the two corner divisions, D and D ([Fig. 161]), on the outside of the wall, while you slide the centre part, E, on the inside ([Fig. 162]). Dotted lines indicate the division E on the inside.

The second story must be built entire before it can be fastened on top of the first story.

Make each of the four walls of the second story three cards long. Cut divisions on both ends of the middle card to fit in the end cards ([Fig. 163]).

When cutting divisions, always fit together the two cards that are to be joined, and cut through the double layer, which will insure having the divisions alike.

When the four walls are ready to be put together, cut a window in the two end cards of the wall which you intend for the front ([Fig. 164]). Only the lower edge and sides of the window may be cut; the upper edge is merely bent and throws the solid window shutter, formed of the piece cut, outward, as shown in the photograph.

Slide the four walls together and add a fifth wall, to run through the centre from side to side, for strength. Use the long slit method for joining the centre wall to the side walls.

When built, turn the second story upside down and fit a strip of three cards, bridge-like, over the centre from front to back, and fasten it to the bottom of the walls as you attached the ceiling of the first story; then fit on another strip in like manner over the centre from side to side, and fasten it to the bottom of the side walls. The two strips will cross each other at their centres, one lying at right angles over the other.

Fig. 162—Fasten ceiling on lower story by sliding the centre division inside, and the two side divisions outside, the wall. Fig. 163—Middle card for wall of second story.

Carefully lift the second story and adjust it squarely and evenly on top of the first story, as in the photograph ([Fig. 156]).