The letters of Muslims are distinguished by several peculiarities dictated by the rules of politeness. The paper is thick, white, and highly polished: sometimes it is ornamented with flowers of gold; and the edges are always cut straight with scissors. The upper half is generally left blank, and the writing never occupies any portion of the second side. A notion of the usual style of letters may be obtained from several examples in the "Thousand and One Nights." The name of the person to whom the letter is addressed, when the writer is an inferior or an equal, and even in some other cases, commonly occurs in the first sentence, preceded by several titles of honour; and is often written a little above the line to which it appertains; the space beneath it in that line being left blank: sometimes it is written in letters of gold, or red ink. A king writing to a subject, or a great man to a dependant, usually places his name and seal at the head of his letter. The seal is the impression of a signet (generally a ring, worn on the little finger of the right hand), upon which is engraved the name of the person, commonly accompanied by the words "His [_i.e._ God's] servant," or some other words expressive of trust in God and the like. Its impression is considered more valid than the sign-manual, and is indispensable to give authenticity to the letter. It is made by dabbing some ink upon the surface of the signet and pressing this upon the paper: the place which is to be stamped being first moistened by touching the tongue with a finger of the right hand and then gently rubbing the part with that finger. A person writing to a superior or an equal, or even to an inferior to whom he wishes to show respect, signs his name at the bottom of his letter, next the left side or corner, and places the seal immediately to the right of this: but if he particularly desire to testify his humility, he places it beneath his name, or even partly over the lower edge of the paper, which consequently does not receive the whole of the impression. The letter is generally folded twice in the direction of the writing, and enclosed in a cover of paper, upon which is written the address in some such form as this:--"It shall arrive, if it be the will of God, whose name be exalted, at such a place, and be delivered into the hand of our honoured friend, etc., such a one, whom God preserve." Sometimes it is placed in a small bag, or purse, of silk embroidered with gold.