The Book of Household Management by Mrs. Beeton

30. IN PAYING VISITS OF CONDOLENCE, it is to be remembered that they

should be paid within a week after the event which occasions them. If the acquaintance, however, is but slight, then immediately after the family has appeared at public worship. A lady should send in her card, and if her friends be able to receive her, the visitor's manner and conversation should be subdued and in harmony with the character of her visit. Courtesy would dictate that a mourning card should be used, and that visitors, in paying condoling visits, should be dressed in black, either silk or plain-coloured apparel. Sympathy with the affliction of the family, is thus expressed, and these attentions are, in such cases, pleasing and soothing. In all these visits, if your acquaintance or friend be not at home, a card should be left. If in a carriage, the servant will answer your inquiry and receive your card; if paying your visits on foot, give your card to the servant in the hall, but leave to go in and rest should on no account be asked. The form of words, "Not at home," may be understood in different senses; but the only courteous way is to receive them as being perfectly true. You may imagine that the lady of the house is really at home, and that she would make an exception in your favour, or you may think that your acquaintance is not desired; but, in either case, not the slightest word is to escape you, which would suggest, on your part, such an impression.