If you are introduced to the relative of a friend, etiquette requires you to consider that relative an acquaintance, unless there is some special reason to the contrary. It is best to avoid introductions in a public conveyance, as few people like to have their names called out in such places. If such introductions are made, however, it should be done as quietly as possible. To introduce to a friend a person who is in any way objectionable, is an insult which fully justifies a withdrawal of friendship. A gentleman should always raise his hat, if introduced in the street, to either lady or gentleman. If introducing a foreigner or a gentleman in this country, whose position gives him an honorary title, always give the title. Thus, if a member of Congress, meeting a German baron at your house, you introduce them, you say: "Mr. Somers, allow me to introduce to you my friend, the Baron von Schmidt; Baron von Schmidt, the Honorable Mr. Somers." LETTERS OF INTRODUCTION. LETTERS of introduction should never be given, except to persons well known to the person introducing them, and addressed to those only who have a long-standing friendship for the writer. Amongst persons but slightly acquainted, such letters are not only foolish but positively dangerous, as you may thus give your countenance to those who will take advantage of your carelessness to bring you into mortifying, if not disgraceful positions. Even amongst friends of long standing they should be given very cautiously and sparingly, as it is a great responsibility to send to your friend a visitor who may prove disagreeable, and you have no right whatever to call upon comparative strangers to extend hospitality or courtesy to your friends. Letters of introduction should always be as short and concise as possible. If you wish to send any information to your friends about their visitor, send it in a separate letter by mail. The utmost brevity is of importance in the letter of introduction, as it is usually read in the presence of the party introduced, and the pause must necessarily be awkward. You may in a letter of introduction use a few words of warm, cordial feeling toward your friend, but praise of any kind is in as bad taste as it would be at a personal introduction. This rule, however, does not apply to letters introducing applicants for favor, office or position, which latter come more strictly under the head of letters of recommendation than merely letters of introduction. Letters of introduction must be left unsealed invariably; they should be folded and addressed like any other letter, but it is a gross breach of etiquette to prevent the bearer from reading what you may have said of him to your friend. It is optional with the bearer to seal such letters before delivery, but it is customary to leave them open.