Thereafter, like the man in the sycamore tree, we made haste to come down. Sixteen days later the column left Lhassa. A few functions intervened, such as the formal release of our prisoners and the bestowal of money in charity on the poor of Lhassa. I missed these functions, having been sent on ahead to the Tsangpo, where preparations for the return crossing were now afoot. The column at length arrived at the river. We crossed this time at Parte, where a certain single channel of moderate breadth, but very deep and therefore not very swift, served our purposes far better than the double channel at Chaksam. The Sappers and Miners and coolis had made all things ready, towing the two heavy ferry boats up many miles of swift current, and rigging up the mysterious engineering paraphernalia which were needed to swing us across, our crossing hanging truly and literally by a thread--a thread of thin wire. Wire, at once the lightest and strongest commodity of its kind, had since our last crossing been sent up to us, in great quantities, and was largely used to replace the now rotten rope that had previously been chiefly employed. A great ferry boat, bearing twenty mules, to which was attached a string of skin boats laden with stores, to which again were attached a brace or so of mules swimming in the water, would be swung across that still swift current, suspended from but one or two thin wires. The speed of the crossing exceeded all hopes. It was accomplished in about forty-eight hours. From South Parte we marched, over a pass that was new to us, straight into Pete-jong. At the top of that pass facing southwards we found a wall, which had obviously been built by the Tibetans in the belief that on our march upwards we would cross the ridge by this route. It was a well-conceived fortification, and might have given us considerable trouble. From Parte Ferry to Gyantse we marched in two columns. Thinking the crossing of the ferry might occupy several days, and in order to be prepared for all emergencies such as any possible ebullitions of hostility that might delay our march, we had laid in at the ferry and the posts on the way to Gyantse a stock of supplies which now proved larger than our needs, while our spare transport was only sufficient to carry on a portion of the surplus.