In any case we were checked again. The mystery deepened. And though the interest might increase, the prospect of finding a way to Chang La, with the necessary margin of time before the end of the month, was still receding, and, whether or no the unexpected should turn out to be the truth, the present situation suggested the unpleasant complication of moving our base once more somewhere away to the North. On the following day with the gathering energy of returning health I set forth with Morshead: we walked in a leisurely fashion up the valley rejected by Bullock and had the surprising good fortune of a clear sky until noon. I soon decided that we were looking up the glacier where we had looked down on the 7th, as Bullock too had decided on the previous day: at the head of it was a high snow col and beyond that the tip of Changtse. What lay between them? If a combe existed there, as presumably it did, the bed of it must be high: there could hardly be room, I thought, for a very big drop on the far side of the col. Might not this, after all, be a sufficiently good approach, a more convenient way perhaps than to mount the glacier from its foot, wherever that might be? The near col, so far as I could judge, should easily be reached from this side. Why not get to the col and find out what lay beyond it? The time had come to abandon our object of finding the foot of a glacier in order to follow it up; for we could more easily come to the head of it and if necessary follow it down.