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Here is a direct quote from the text. It's all in Chapter 3 of part 1,
The emperor’s palace is in the centre of the city where the two great streets meet. It is enclosed by a wall of two feet high, and twenty feet distance from the buildings. I had his majesty’s permission to step over this wall; and, the space being so wide between that and the palace, I could easily view it on every side. The outward court is a square of forty feet, and includes two other courts: in the inmost are the royal apartments, which I was very desirous to see, but found it extremely difficult; for the great gates, from one square into another, were but eighteen inches high, and seven inches wide. Now the buildings of the outer court were at least five feet high, and it was impossible for me to stride over them without infinite damage to the pile, though the walls were strongly built of hewn stone, and four inches thick.