. Results of a biological survey of Mount Shasta, California. Natural history; Natural history. OCT., 1899.] WHITE-BARK PINE BELT. 39 non Bailey, in following the wagon road around the mountain, passed through a belt of it about 8 miles in length. It begins 3 miles northeast of Ash Creek at an altitude of about 5,400 feet and reaches northerly to about 3 miles northwest of Inconstauce Greek, where it ends abruptly at an altitude of 5,C00 feet. Here it is the dominant tree, and in half of it the only tree. This area is covered during the latter part of the afternoon by the shadow of the mountai
. Results of a biological survey of Mount Shasta, California. Natural history; Natural history. OCT., 1899.] WHITE-BARK PINE BELT. 39 non Bailey, in following the wagon road around the mountain, passed through a belt of it about 8 miles in length. It begins 3 miles northeast of Ash Creek at an altitude of about 5,400 feet and reaches northerly to about 3 miles northwest of Inconstauce Greek, where it ends abruptly at an altitude of 5,C00 feet. Here it is the dominant tree, and in half of it the only tree. This area is covered during the latter part of the afternoon by the shadow of the mountain, and conse- quently is colder than places of equal altitude farther north or south. The soil is sandy and barren and the trees are of small size. (3) The Upper Belt or Belt of White-Bark Pines (Pjmjts albicauUs). Still above the forest of Shasta flrs, braving its way upward over the bare rocky ridp-^s into the very teeth of the domain of perpetual snow, is another timber belt—aTi (pen belt of straggling, irregular trees, whose. Fig. 21.—Dwarf white-bark piues on a hi^li ridge. whitened, twisted trunks with their stormbeateu heads of green are among the most weirdly picturesque objects on the mountain (fig. 20). The tree is the timberline white-bark pine, which, wherever found, pushes its way over steep and barren slopes to the extreme upper limit of tree growth. At the lower part of its range it forms an almost continuous though narrow belt around the mountain, and often attains a height of 30 or 40 feet and a diameter of 2 feet. In the higher parts of its range it soon becomes restricted to the ridges, leaving the intervening basins and gulches bare, and as it climbs higher and higher becomes more and more reduced in size and undergoes material changes of form and posi- tion. At certain altitudes the slanting trunks, only 4 or 5 feet in height, serve as pillars to support the flattened tops which form a canopy of intertwined and matted branches (iig. 21).. Please note th
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