After completing our observations, we fastened the little tent as securely as possible, banking the snow around it, and left it on top, first having placed in it one of the Appalachian Mountain Club's brass record cylinders, in which we had sealed the Yale flag, a contemporary map of Peru, and two brief statements regarding the ascent. The American flag was left flying from a nine-foot pole, which we planted at the northwest rim of the dome, where it could be seen from the road to Cotahuasi. Here Mr. Casimir Watkins saw it a week later and Dr. Isaiah Bowman two weeks later. When Chief Topographer Hendriksen arrived three weeks later to make his survey, it had disappeared. Probably a severe storm had blown it over and buried it in the snow. We left the summit at three o'clock and arrived at the 20,000 foot camp two hours and fifteen minutes later. The first part of the way down to the saddle we attempted a glissade. Then the slope grew steeper and we got up too much speed for comfort, so we finally had to be content with a slower method of locomotion. That night there was very little wind. Mountain climbers have more to fear from excessively high winds than almost any other cause. We were very lucky. Nothing occurred to interfere with the best progress we were physically capable of making. It turned out that we did not need to have brought so many supplies with us. In fact, it is an open question whether our acute mountain-sickness would have permitted us to outlast a long storm, or left us enough appetite to use the provisions. Although one does get accustomed to high altitudes, we felt very doubtful. No one in the Western Hemisphere had ever made night camps at 20,000 feet or pitched a tent as high as the summit of Coropuna. The severity of mountain-sickness differs greatly in different localities, apparently not depending entirely on the altitude. I do not know how long we could have stood it. It is difficult to believe that with strength enough to achieve the climb we should have felt as weak and ill as we did.