Two things have more especially caused my Admiration. The first is, that in this long extent from the East to the West, it passes in several places not only through vast Champains, but also above the tops of exceeding high Mountains, upon which it is raised by little and little, and fortify'd at certain Intervals with great Towers; not distant the one from the other more than two flight Shot. At our return I had the Curiosity to measure the height of it in one place by means of an Instrument, and I found that it was in that Place 1037 Geometrical Feet above the Horison; in such sort that 'tis hard to comprehend how 'twas possible to elevate this enormous Bulwork to the height we saw it, in places dry and full of Mountains, whence they must be obliged to bring from a great distance with incredible Labour, the Water, Brick, Mortar, and all the Materials necessary for so great a Work. The second thing that surprized me was, that this Wall is not continued upon the same Line, but bent in divers places following the situation of the Mountains, in such manner, that instead of one Wall, one may say that there are three, which Environ all this great part of _China_. After all, The Monarch which in our Days hath re-united the _Chinese_ and the _Tartars_, under one and the same Government, has done some things more for the advantage of the security of _China_, than the _Chinese_ Emperor that built the long Wall. For after having reduced the Western _Tartars_, partly by Artifice, partly by force of Arms: He has obliged to go and remain at 300 Miles distance from the Wall of _China_; and in this Place he distributes to them Land and Pastures, whilst he has given their Country to other _Tartars_, his Subjects which have their Habitation there at present: Notwithstanding which, these Western _Tartars_ are so powerful, that if they should agree together, they might make themselves Masters of all _China_, and of the Eastern _Tartary_, even in the Face of the Oriental _Tartars_.