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338 Woodcraft Manual for Girls When the string is firmiv pulled, the twig givfy and the door it pulled down over the hole. The advantages of the Woodcraft Bird Box over the other kinds are: It is cheap. It is picturesque. It is observational. It is sparrow-proof. Books Recommended Makinc; of a Hollow I'kkk, by K. T. Scton, Coiintrv Life in Atimk*. .NovetnlHT, u>o«, and seq. IVttino LP Biiu) HoxKs, by B. S. Bowdish (specuJ leaflet). Audubon Society, 1974 Braedway, New York, 15 cenU per dosen. Useful Birds and Their Pkotection, by K. H. Foibuth. Uf uwrhn- setts State Hoartl Agriculture^). 388. * '^'^'^ For Utest ideas send to The Jacobs Bird House CompMiy, 404 So. Washington Straet, Waynesburg, Pa. "™i*«y, 4«H «»• Knots The following are standard knots that an accmnpUshed camper should know. Rememher, a {jerfect knot is one that neither jambs nor slips. See pages 2.40, 241. Blazes and Signs First among the trail signs that are used by Woodcraflers, Indians, and white hunters, and most likely to be of use to the traveler, are axe blazes on tree trunks. Among these some may vary greatly with locality, but there is one that I have found everywhere in use with scarcely any variation. That is the simple white spot meaning, '*Here is the trail." The Indian in making it may nick off an infinitesimal speck of bark with his knife, ».he trapper with his hatchet may make it as big as a dollar, or the settler with his heavy axe may slab off half the tree-side; but the sign is the same in principle and m meaning, on trunk, log, or branch from Atlantic to Pacific and from Hudson Strait to Rio Grande. "This is your trail," it clearly says in the universal language of the woods. There are two ways of employing it: one when it ai^)ears on back and front of the trunk, so that the Uail can be run