It is not necessary to introduce people who meet at your house on morning calls, though it may be done with propriety if the introduction has been previously ascertained to be mutually pleasant. It is optional after such an introduction, with the parties introduced, to continue or drop the acquaintance so formed. Without a formal introduction, the merely meeting at the house of a mutual friend, does not warrant any future recognition. It rests, however, after an introduction with the lady, if between lady and gentleman, with the married or elder lady, if between lady and lady, and with the elder, if between gentlemen, to continue or drop the acquaintance. Gentlemen who meet at the house or rooms of a mutual friend are not obliged to recognize one another if they meet again elsewhere. There is no rule forbidding their doing so, if agreeable to both parties, but there is no requirement of etiquette obliging them to appear as if they had even met before. A lady is not obliged to afterwards recognize a partner with whom she may have danced at a ball. It is entirely optional with her to do so or not; and if she has danced several times with the gentlemen, it will be a question between her and her conscience how far she may consider herself justified in passing by without notice one who has extended to her so much courtesy at a ball. Etiquette, however, does not require even the slightest recognition. When strangers in a city are introduced to residents it is customary to name the place from which they come, thus: "Allow me to introduce to you my friend Mr. Schmidt, from Germany. Mr. Schmidt, Mr. Popking;" or if introducing a traveller, "Allow me to introduce my friend Mr. Robinson, lately returned from Egypt." A pleasant opening is thus offered for conversation, and a foreigner may have the pleasure of a salutation in his own language. An important duty in introducing friends is to pronounce the name of each party clearly and distinctly, that no error or necessity for repetition may occur. It is often a positive kindness to take advantage of the etiquette which dispenses with introductions at morning calls. Many a witty, talented person has had a stupid bore pursue him upon such an introduction, and even the one necessary conversation following an introduction is a painful effort, owing to the entire uncongeniality of the parties introduced. A friend visiting at your house must be introduced to all callers, who are bound to continue the acquaintance as long as the friend is your guest. So, if when calling upon a friend, you are introduced to a visitor, you are bound to extend all courtesies and attentions which you would desire paid to your visitors in similar circumstances. Introductions, given at a party to a stranger visiting in a city, must be followed by recognition as long as the visit continues.