The attached letter, Number 29, was used by Twain in both this chapter and in chapter 45. The first two sections, a description of a Syrian village and the story of Nimrod were used in chapter 45 along with the final paragraph about his second horse of the journey, Baalbec. The section on the ruins of Baalbec (not the horse) were used in this chapter. Of particular interest, to me anyway, is Twain's discussion of the quality of mercy and how it is distinguished in issues of the letter of the law and the spirit of the law. In this case, in the keeping of the Sabbath.