Every lodge-pole forest is a fire-trap. The thin, scaly, pitchy bark and the live resiny needles on the tree, as well as those on the ground, are very inflammable, and fires probably sweep a lodge-pole forest more frequently than any other in America. When this forest is in a sapling stage, it is very likely to be burned to ashes. If, however, the trees are beyond the sapling stage, the fire probably will consume the needles, burn some of the bark away, and leave the tree, together with its numerous seed-filled cones, unconsumed. As a rule, the fire so heats the cones that most of them open and release their seeds a few hours, or a few days, after the fire. If the area burned over is a large one, the fire loosens the clasp of the cone-scales and millions of lodge-pole seeds are released to be sown by the great eternal seed-sower, the wind. These seeds are thickly scattered, and as they germinate readily in the mineral soil, enormous numbers of them sprout and begin to struggle for existence. I once counted 84,322 young trees on an acre. The trees often stand as thick as wheat in a field and exclude all other species. Their growth is slow and mostly upright. They early become delicate miniature poles, and often, at the age of twenty-five or thirty years, good fishing-poles. In their crowded condition, the competition is deadly. Hundreds annually perish, but this tree clings tenaciously to life, and starving it to death is not easy. In the summer of 1895 I counted 24,271 thirty-year-old lodge-poles upon an acre. Ten years later, 19,040 of these were alive. It is possible that eighty thousand, or even one hundred thousand, seedlings started upon this acre. Sometimes more than half a century is required for the making of good poles. On the Grand River in Colorado I once measured a number of poles that averaged two inches in diameter at the ground and one and one half inches fifteen feet above it. These poles averaged forty feet high and were sixty-seven years of age. Others of my notes read: "9728 trees upon an acre. They were one hundred and three years of age, two to six inches in diameter, four and a half feet from the ground, and from thirty to sixty feet high, at an altitude of 8700 feet. Soil and moisture conditions were excellent. On another acre there were 4126 trees one hundred and fifty-four years old, together with eleven young Engelmann spruces and one _Pinus flexilis_ and eight Douglas firs. The accumulation of duff, mostly needles, averaged eight inches deep, and, with the exception of one bunch of kinnikinick, there was neither grass nor weed, and only tiny, thinly scattered sun-gold reached the brown matted floor."