CHAPTER XXII.
ANALYSIS OF AUTHOR'S SURVEY OF THE DESERT.
In Chapter XVI I have given a brief description of the general character of the Desert of Lop from the point of view of its physical geography, and in Chapter XVII a general account of the manner in which, and the circumstances under which, my survey of that desert was carried out, from the northern shore of the ancient Lop-nor at Lôu-lan to the eastern part of the northern shore of the Karakoschun. In order not to lose the chronological sequence of the various phases of the Lop-nor problem, I have interpolated an account of the historical aspects of the question, together with a critical examination of some Chinese maps. I must now submit my survey-line to a closer analysis.
In the following table I have recorded all the readings I made, both backwards and forwards, the differences between the several pairs of readings, the altitude of each of the 34.6 stations in relation . both to the point of departure and to the level of the Kara-koschun, the distances between the staff and the telescope and between the telescope and the staff, the bearings of each successive section- of the traverse, and finally the situation of the seven camps at the end of each day that we were engaged upon the work.
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