Never introduce people to each other unless you feel quite sure that it will be agreeable to both parties. We have said before that it is right to introduce the gentleman to the lady, even when the social rank of the former is higher, because ladies have always the precedence of gentlemen.
If you are walking with one friend and meet another on the road, you must not introduce them to each other, unless you know previously that they wish for an introduction.
At a ball the lady of the house may introduce a gentleman to a lady without permission, in order that he may ask her guest to dance.
Ladies are not obliged to consider their ball-partners as acquaintances, unless they please.
It is the lady's place to bow first to a gentleman.
It is no longer necessary to introduce the guests to each other at an evening party. You may talk to any one sitting near you easily and courteously without any introduction. The fact of the lady or gentleman being at your friend's house is a sufficient introduction.
Letters of introduction should only be given to introduce the bearer to a very intimate friend of your own. You put yourself under a great obligation to the person whom you request to show civility or kindness to a stranger.
Always reflect whether the person who wishes to be introduced would be agreeable to your friend, and whether you have any right to tax her time and hospitality for another.
Should you have a letter of introduction given to you, be sure to send it (inclosing your card). Do not on any account call with it yourself. If the receiver of the letter is really well-bred, she will call upon you or leave her card the next day, and you may then return her visit. She ought to invite you to her house if possible, or to show you any other attention which may be in her power.
If you are yourself the recipient of a letter from a friend presenting a foreigner to you, etiquette demands that you should escort her to any exhibition, whether national or otherwise, which might prove of interest, and make a little party or invite a few friends to dinner, to entertain the stranger. In short, that best and most unfailing guide to good-breeding, "Do unto others as you would they should do unto you," will best direct your conduct.
The letter of introduction is better unsealed. You should request your friend to fasten it previous to delivering it, which is virtually giving her permission to read it first.