Under the torrid zone, away out on the Islands of the Pacific Ocean, the natives coast down-hill, in the hottest weather, on the dry grass, and where that does not exist they build themselves toboggan-slides, with slabs of smooth lava. Hundreds of these tracks line the mountain-sides near the native villages. The sled these daring coasters use is from seven to twenty feet long, and as narrow in proportion as a shell-boat, there being only a few inches of space between the very hard, polished wooden runners. It takes both skill and pluck to ride one of these cranky tropical sleds, or toboggans, but the natives possess both of these qualities, and without a thought of failure pick up their primitive machine, take a short, swift run, and throw the sled and themselves together, headlong down the lava-slide. There follows a wildly exciting and breathless ride down the incline, and a scoot over the level country, until gradually the queer sled slows up and comes to a stop; and then there is a long climb back, for another daring coast to the quiet valley below. In the United States we have no smooth lava with which to build slides on our native hills, and if we did have the lava-slides only a few of our boys would have an opportunity to use them. When the snow covers the ground it is not every boy who can find a convenient hill where he may enjoy the healthful fun of coasting. A great many boys live in a level country, and hundreds and thousands of others have their homes in cities and towns, where heavy carts, policemen, and trolley-cars, make coasting a forbidden pleasure. However, with a real toboggan-slide in the back-yard, a boy may snap his fingers at a level country, lumbering carts, death-dealing cars, and meddlesome guardians of the peace. In a day’s time three boys can build a slide; but, of course, it cannot be built without some labor. If it could, it would be of no value. The labor consists only in sawing a few pieces of timber and driving a few nails to hold the frame together, and it is effort well-spent. If Your Back-Yard is Wide enough you can run the toboggan-track alongside the back fence, with the starting platform built in the fence-corner, backing against the side fence. In this way your slide will occupy but little space. But if Your Yard is Long and Narrow, build your platform against the back fence (as described in Chapter XIV.), and let the track run along one of the side fences. The most difficult part of the work is now finished. Make A Frame, on the pattern of C, E, D, G (Figs. 133 and 134, Chapter XIV.), and about half the height of the platform (see L, M, N, Fig. 138). Erect this frame in front of the platform, and at such a distance from it as will allow your longest boards to span the intervening space, as in Fig. 138. Nail two diagonals--one at each top end of the frame M, L, N, and fasten the opposite ends of the diagonals to the bottoms of C and D.