Thus we have described ten constellations from which the woodcrafter may select the number needed to qualify, namely, the Little Bear, or Little Dipper, the Big Dipper or Big Bear, Cassiopeia's Chair, the Bull, Orion's Hound, Orion's Little Dog, the Pleiades and the Hyades; the Lyre (later). The Moon The moon is one-fourth the diameter of the earth, about one-fiftieth of the bulk, and is about a quarter of a million miles away. Its course, while very irregular, is nearly the same as the apparent course of the sun. It is a cold solid body, without any known atmosphere, and shines by reflected sunlight. The moon goes around the earth in twenty-seven and a quarter days. It loses about fifty-one minutes in twenty-fours hours; therefore it rises that much later each successive night on the average, but there are wide deviations from this average, as for example, the time of the Harvest and Hunter's moons in the fall, when the full moon rises at nearly the same time for several nights in succession. According to most authorities, the moon is a piece of the earth that broke away some time ago; and it has followed its mother around ever since. The Stars as Tests of Eyesight In the sky are several tests of eyesight which have been there for some time and are likely to be. The first is the old test of Mizar and Alcor. Mizar, the Horse, is the star at the bend of the handle of the Dipper. Just above it is a very small star that astronomers call Alcor, or the rider. The Indians call these two the "Old Squaw and the Papoose on Her Back." In the old world, from very ancient times, these have been used as tests of eyesight. To be able to see Alcor with the naked eye means that one has excellent eyesight. So also on the plains, the old folks would ask the children at night, "Can you see the papoose on the old Squaw's back?" And when the youngster saw it and proved that he did by a right description, they rejoiced that he had the eyesight which is the first requisite of a good hunter. One of the oldest of all eye tests is the Pleiades. Poor eyes see a mere haze, fairly good see five, good see six, excellent see seven. The rarest eyesight, under the best conditions, see up to ten; and, according to Flammarion, the record with unaided eyes is thirteen. Vega of the Lyre If one draw a line from through the back wall of the Dipper, that is, from the back bottom star, through the one next the handle, and continue it upward for twice the total length of the Dipper, it will reach Vega, the brightest star in the northern part of the sky, and believed to have been at one time the Pole-star--and likely to be again. Vega, with the two stars near it, form a small triangle. The one on the side next the North Star is called Epsillon. If you have remarkably good eyes, you will see that it is a double star. The Nebula in Orion's Sword