Now is the time to invite all your friends to a grand old-time log-rolling; ask the girls to come and cook the coffee and make the sandwiches. The two end-logs may first be rolled down from the skids, notched and fitted in place across the ends of sill-logs (Fig. 93), and then the next two side-logs, and so on, alternating until the walls are built; but you must remember to allow for the doors, windows, and fireplace openings. When the walls are so high that it is a difficult task to lift the logs in position, put up a couple of skids and roll the logs up the incline, which is better than wasting your strength in trying to lift such burdens. When the walls have reached the height of the top of the lowest opening, nail some Door and Window Opening planks, temporarily, close to the proposed opening on both sides of it, and on the inside and outside of the house; this is to hold the logs in position while the opening is being cut. A, in Fig. 99, shows a binder. After the binders are in place, saw the top log through at the proposed opening, to allow room for the saw, and then proceed to build as before. See Fig. 98, showing opening over door and window; the binders are not shown in this diagram. [Illustration: FIGS. 97 and 98.] A Fireplace is by no means an absolute necessity for a summer cabin, but an open fire is a great addition to a house, and upon cool evenings, even in the summer-time, its genial warmth is not to be despised. The protruding ends of the logs, at the four corners of the cabin, may be left as they happen to be until the house is finished, no matter how irregular their appearance. With a two-handled saw, and a boy at each end, the ends may be cut off evenly; this will give a finished appearance to the cabin. You can have Any Sort of a Roof which suits your fancy; it may be framed, as described in Chapter VII., or, by using round poles, it may be framed as shown by Fig. 98 and roofed with slabs or planks, as shown by Fig. 100, or the roof may be shingled with “clapboards,” a name used for shingles or boards, about three feet long, and laid on as ordinary shingles are--first course at the eaves, second course breaking joints and overlapping the first, and so on, until the roof-tree is reached. If shingles, clapboards, and planks are out of reach, the roof may be shingled with bark; if birch bark is used, it can be held in place by poles laid upon the outside of the roof, as I have often seen the hand-rived clapboards held in place where they use no nails in the construction of their homes. The Most Essential Piece of Furniture