Down Bright Angel Trail. After one has gained the slight knowledge of the Canyon afforded by the easier trips described, let him plan to make the following as "a starter" in his more thorough investigation. With a good guide, pack animals carrying a full equipment of sleeping, cooking and eating necessities, plenty of water in canteens, one or two extra canvasses in case of rain, a note-book, and pencils or fountain pen, a compass and barometer for altitude readings, and the United States Geological Survey maps of the region, one is ready to make a "good start." Descend the Bright Angel Trail to the river, study the formations all the way down; get a clear idea of the relative positions of the strata, and learn to detect them by the individualistic appearances of wall, temple, butte, etc.; and examine the so-called cliff-dwellings hidden away in the Tonto sandstones before descending on the gneiss into Pipe Creek Canyon. Arrived at the river, spend a day there investigating the peculiar foldings and tiltings of the Algonkian strata. Sleep, as did Powell and his men for weeks, on the sands of the Colorado River, with the noise of the rapids ever in your ears. Breathe the pure air, and watch the solemn march of the stars.