During the various expeditions of our reconnaissance I came to employ two distinct methods of working the legs with the lungs. As soon as conscious breathing was necessary it was my custom deliberately to inhale on one step and exhale on the next. Later, at a higher elevation, or when the expenditure of muscular energy became more exhausting, I would both inhale and exhale for each step, in either case timing the first movement of lifting the leg to synchronise with the beginning, so to speak, of the breathing-stroke. On this occasion as we pushed our way up towards Lhakpa La I adopted a variation of this second method, a third stage, pausing a minute or so for the most furious sort of breathing after a series of steps, forty or thirty or twenty, as the strength ebbed, in order to gain potential energy for the next spasm of lifting efforts. Never before had our lungs been tested quite so severely. It was well for us that these final slopes were no steeper. It was difficult and tiring enough as it was to prevent the rackets sliding, though without them we could not possibly have advanced in such snow. But happily the consequences of a slip were not likely to be serious. We were able to struggle on without regarding dangers, half-dazed with the heat and the glare and with mere fatigue, occasionally encouraged by a glimpse of the skyline above us, a clean edge of snow where the angle set back to the pass, more often enveloped in the scorching mist which made with the snow a continuous whiteness, so that the smooth slope, even so near as where the foot must be placed next, was usually indistinguishable. We had proceeded a considerable distance and I was satisfied with our progress, when the leader broke the monotony; he was seen to hesitate in the act of stepping up, to topple over and fall headlong downwards. This time he had guessed wrong; his foot had hit unexpectedly against the steepening slope. Somehow he had passed in extreme fatigue from the physical state of stable equilibrium; he had become such a man as you may "knock down with a feather," and this little misadventure had upset his balance. Mere surprise gave him strength to stop his slide. He raised himself, disgusted, to his feet again and after sundry gruntings the party went on. Some little way further up Major Morshead, who was walking last in the party, with one brief exclamation to tell us what he intended, quietly untied the rope and remained where he was in his steps, unable to go further. At length we found ourselves on flatter ground; the pass was still invisible, how far ahead of us we could not guess. Unexpectedly we came upon the brink of a crevasse. We worked round it, vaguely wondering whether after all our pains we were to meet with many troubles of this sort. And then after a few more steps we were visibly on some edge of things; we had reached the col itself.