Alternating with the spiny ribs, and just beneath the epidermis, are ligneous fascicles--one for each rib--which serve as a support for the soft tissues which constitute the bulk of the plant. These fascicles are from twenty to forty feet long, according to the height of the plant, and are from one to three inches in diameter. They constitute the framework or skeleton of the plant, and are left standing when the plant itself dies from age or other cause. This frame is of great value to the desert Indians or to desert travelers who know its properties. The fascicles make excellent firewood, and when cut into required lengths they are used as pickets with which to build corrals, and for the roofs to the adobe huts. The spines of the plant are also used by the Indians as combs. The plant lives to be more than one hundred and fifty years old, as has been determined by counting the layers of growth. The first flowers appear when the plant has attained a height of eight or ten feet, and they come into bloom early in May and continue in blossom till near the middle of June. The blossoms are large, white, and waxy. The flowers are borne in the axils of the bunches of spines, often fifty or more blossoms in the summit of a single branch. It comes to fruit in August, and then it is that the Indians ride from plant to plant and with long poles detach the fruit, which is gathered and preserved as food or is made into an intoxicating drink of which they are very fond. [Illustration: SPANISH BAYONET From photograph by C. C. Pierce & Co.] Another plant, a species of yucca, abundant in the southern deserts, is the Spanish bayonet. These plants have a thick, palm-like stem or trunk with long, thick, spine-pointed leaves. The flowering stem shoots up many feet in height and bears myriads of white, showy, panicled flowers, lily-like in appearance. As many as six thousand blossoms have been observed upon a single plant. An interesting peculiarity of this plant is that it cannot pollenize itself, but is obliged to depend for its perpetuity upon a little moth whose sole aim in life seems to be to perform the work of pollenizing this plant. This moth does not eat the honey or pollen of the plant, but lays her eggs upon the stigma of the flower and then gathers the pollen of the blossom and deposits it over the eggs, thus protecting the eggs and pollenizing the plant at the same time. The larvæ hatch at the time that the flower goes into seed, and the grubs feast upon the seeds, destroying a part of them, but leaving enough to keep up the supply of plants. The Indians eat the undeveloped flower-shoots of this plant raw, the stalks are roasted over hot stones and make a very palatable dish; the fruit, which is cylindrical and yellow, ripening in August and September, is eaten raw, and is also dried for future use. It is pulpy, sweet, and nourishing.