Besides two seasons of this preliminary experience, the rocks, glacial records, birds, trees, and flowers along the trail were studied, other peaks climbed, and books concerning mountain-climbing diligently read. But long before my two hundred and fifty-seven guiding trips were completed, I found myself ignorant of one of the most important factors in guiding, and perhaps, too, in life,--and that is human nature. Several climbs had been made simply to learn the swiftest pace I could maintain from bottom to summit without a rest. Thus ably coached by experience, I steadied to the work when my noisy football-players started to run away from me. Each player in turn briefly set a hot pace, and in a short time they were ahead of me. Even though they guyed me unmercifully, I refused to be hurried and held to the swiftest pace that I knew could be maintained. Two hours raised us through thirty-five hundred feet of altitude and advanced us five miles. We were above the timber-line, and, though some distance behind the boys, I could tell they were tiring. Presently the guide was again in the lead! By-and-by one of the boys began to pale, and presently he turned green around the mouth. He tried desperately to bluff it off, but ill he was. In a few minutes he had to quit, overcome with nausea. A moment later another long-haired brave tumbled down. On the others went, but three more were dropped along the trail, and only two of those husky, well-trained athletes reached the summit! That evening, when those sad fellows saw me start off to guide another party up by moonlight, they concluded that I must be a wonder; but as a matter of fact, being an invalid, I had learned something of conservation. This experience fixed in my mind the importance of climbing slowly. Hurriedly climbing a rugged peak is a dangerous pastime. Trail hurry frequently produces sickness. A brief dash may keep a climber agitated for an hour. During this time he will waste his strength doing things the wrong way,--often, too, annoying or endangering the others. Finding a way to get climbers to go slowly was a problem that took me time to solve. Early in the guiding game the solution was made impossible by trying to guide large parties and by not knowing human nature. Once accomplished, slow going on the trail noticeably decreased the cases of mountain-sickness, greatly reduced the number of quarrels, and enabled almost all starters to gain the height desired. Slow climbing added pleasure to the trip and enabled every one to return in good form and with splendid pictures in his mind.