The Ladies' Book of Etiquette, and Manual of Politeness

A well-bred lady, who is receiving several visitors at a time, pays equal attention to all, and attempts, as much as possible, to generalize the conversation, turning to all in succession. The last arrival, however, receives a little more attention at first, than the others. If it is not agreeable to you to set aside a day for the especial reception of callers, and you have a large circle of acquaintances, be ready to receive them each day that you are at home. If you are engaged, let the servant say so when she opens the door, and do not send down that message after your friend has been admitted. If she is told when she arrives that you are engaged, she will understand that you are denied to all callers, but if that message comes after she has sent up her card, she may draw the inference that you will not see her, though you may see other friends. Never keep a caller waiting whilst you make an elaborate toilette. If you are not ready for visitors, it is best to enter the parlor in your wrapper, apologizing for it, than to keep your friend waiting whilst you change your dress. If a stranger calls, bringing a letter of introduction, and sends the letter, you may read it before going down stairs, but if they wait till you are in the parlor before presenting the letter, merely glance at the signature and at the name of your caller; do not read the letter through, unless it is very short, or you are requested by the bearer to do so.